You just basically said (using other words) how you are now in agreement with the OP. At one point, you made it seem like you were in disagreement. This is deception.
I don't think
@marks is in agreement with me since the very verses you've quoted was quoted to me.
Whoever has suffered in the flesh, that is, in the body, has ceased from sin.
The believer is faced with two possibilities—sin or suffering.
On the one hand, he can choose to live like the unsaved people around him, sharing their sinful pleasures, and thus avoid persecution. Or he can live in purity and godliness, bearing the reproach of Christ, and suffer at the hands of the wicked.
James Guthrie, a martyr, said just before he was hanged, “Dear friends, pledge this cup of suffering as I have done, before you sin, for sin and suffering have been presented to me, and I have chosen the suffering part.”
When a believer deliberately chooses to suffer persecution as a Christian rather than to continue in a life of sin, he has ceased from sin.
This does not mean that he no longer commits acts of sin, but that the power of sin in his life has been broken. When a man suffers because he refuses to sin, he is no longer controlled by the will of the flesh.
He that hath suffered - a thing now past [ pathoon (G3958)]: Christ first, and in His person the believer: a general proposition.
Hath ceased , [ pepautai (G3973)] - ’has been made to cease;’ i:e., has obtained by His past and completed suffering a cessation from sin, which heretofore lay on him (Rom_6:6-11, especially 7). The Christian is by faith one with Christ: as Christ by death is judicially freed from sin, so the Christian who has in the person of Christ died has no more to do with it judicially, and ought have no more to do with it actually. "The flesh" is the sphere in which sin has place.
JFB
for he that hath suffered in the flesh hath ceased from sin: meaning either Christ, who having suffered in human nature for the sins of his people, whereby he has made satisfaction for them, is now clear of them; the sins that were imputed to him being took and bore away, finished and made an end of, and he justified from them, and freed from all the effects of them, and punishment for them, as from all the infirmities of human nature, from mortality and death: or the person that has suffered in and with Christ, his head and representative, which is all one as if he had suffered himself, in person; by virtue of which his sin ceases, and he ceases from being chargeable with it, as if he had never sinned; which is the case of every criminal, when he has suffered the penalty of the law for his crime: or else the person that is dead to sin, by virtue of the death of Christ, and, in imitation of it, who has been baptized into Christ's death, and planted in the likeness of it; whose old man is crucified with Christ, and he is dead with him; who has crucified the affections with the lusts, and through the Spirit has mortified the deeds of the body; which way the generality of interpreters go: such a man has ceased from sin; not from the being and indwelling of it in him; nor from the burden of it on him; nor from a continual war with it in him; nor from slips and falls by it, and into it; no, nor from it in the most solemn and religious services; but as from the guilt of it, and obligation to punishment by it, through the death of Christ; so from the servitude and dominion of it, through the power of divine grace, in consequence of Christ's death: or rather, the believer that suffers death in his body, for the sake of Christ, such an one immediately ceases from the very being of sin, and all commission of it; he becomes at once perfectly pure and holy, without spot or wrinkle, or any such thing; and a noble argument this is to meet death without fear, and to suffer it cheerfully and willingly, since the consequence of this will be an entire freedom from sin, than which nothing can be more desirable by a believer: to this agrees the Syriac version, which renders the words thus: "for whoever is dead in his body hath ceased from all sins"; but the Arabic version more fully confirms this sense, and is the best version of the text, and is this; "be ye armed with this (same) thought, that (not for) he that hath suffered in the flesh hath ceased from sin"; that is, fortify your minds against all the fears of sufferings, and of death, for the sake of Christ, with this single thought; that he that has suffered martyrdom for Christ, in his body, or has suffered death for his sake, or dies in the Lord, is free from sin, and so from sorrow, and is the most happy person imaginable; so that this last clause is not a reason of the former, but points out, and is explanative of what that same mind or thought is Christians should arm themselves with, against the fears of death; and it is the best piece of armour for this service, a saint can make use of.
Gill.

Now, how do you explain the 2nd Aorist and the Perfect/Passive Tense in pauo?
πεπαυται
G3973
V-RPI-3S
παύω
to stop
παύω
paúō; fut. paúsō. To stop, pause, make an end. Used chiefly in the mid. paúomai, meaning to come to an end, take one's rest, a willing cessation (Luk_5:4). Contrast the pass. voice which denotes a forced cessation. Used in the act. voice in 1Pe_3:10, to cause to cease, in allusion to Psa_34:13-14. Intrans., to refrain, pause, leave off, followed by the gen. of the thing (1Pe_4:1, "hath ceased from sin"; Sept.: Exo_32:12; Jos_7:26). With the neg. particle ou (G3756), not (Act_5:42, "they ceased not to teach"; Act_6:13; Act_13:10; Act_20:31; Eph_1:16; Col_1:9; Heb_10:2). Followed by a part. (Act_21:32; Eph_1:16); with part. implied (Luk_11:1; Sept.: Gen_11:8; Gen_18:33; Gen_24:19, Gen_24:22); used in an absolute sense, to cease, come to an end (Luk_8:24; Act_20:1; 1Co_13:8; Sept.: Exo_9:33-34).
Deriv.: anapaúō (G373), to relax, rest inwardly but not necessarily as a result of the cessation of work; katapaúō (G2664), to rest.
Syn.: dialeípō (G1257), to leave an interval whether of space or time, to intermit, desist, cease; kopázō (G2869), to stop as a result of being tired, relax, subside, calm down; hēsucházō (G2270), to become quiet, still, at rest; katargéō (G2673), to render inactive, abolish.
Ant.: exakolouthéō (G1811), to follow out, continue; epiménō (G1961), to persist, continue on; epakolouthéō (G1872), to follow after; diateléō (G1300), to continue.
1 Peter 4:1d
by Grant Richison
Read Introduction to 1 Peter
“Therefore, since Christ suffered for us in the flesh, arm yourselves also with the same mind, for he who has suffered in the flesh has ceased from sin.”
for he who has suffered in the flesh
By arming ourselves with the mind of Christ we will no doubt suffer the same suffering Jesus suffered. Jesus suffered in the body and so will the Christian. If we suffer as Jesus suffered, we cease from sin. When we identify with Christ’s suffering, we free ourselves from sin. God expects us to make a clean cut break with habitual sinning.
has ceased from sin
“Ceased” means to stop, to make an end. When we think like Jesus thought, our sinful thinking comes to an end. This verse does not say that the Christian has ceased completely from sinning for that would be sinless perfection. No Christian can reach a stage of sinless perfection but can come to a place of victory over sin.
This verse says that the Christian has ceased at a point in the past with the results going on (perfect tense). God gave us release from sin when we received Christ as Savior. God broke the power of sin at Christ’s death. We can translate “cease” as “has been made to cease.” We have been made to cease from sin in the death of Christ.
We do not fight for victory over sin because Christ has already won the victory. We fight a victory already won (Ro 6:6-11, esp. v7). God gave us release from sin by Christ’s final suffering for sin. We react to undeserved suffering as a saint, not a sinner. It is God who released us from sin. God broke the power of sin by Christ’s death.
Also, God did not free from sins (plural) but from “sin” (singular). Sin in the singular is the depraved capacity for sin that we received when born into this world. The potential for sin is always present in that nature because it never improves, never alters, or changes. It cannot improve by education or refinement.
PRINCIPLE:
Dead men do not sin.
APPLICATION:
We lose our tenderness toward Christ if we do not deal decisively with sin. He died to deal with sin and he dealt with it decisively on the cross. If we do not deal with it ourselves, sin will invade our daily relationship with him.
We deal with sin first in our mind, not by outward rite of religion. Our natural mind is dark and alienated from the life of God (Eph. 4:18). That makes us disingenuous with God. We are blind to our own wicked motivations until we deal with sin.
Some of us are so dull spiritually that we do not even recognize what springs from our sin capacity. Spiritual callousness sets in our soul, and we become immune to deal with deadly sin in our lives.
We cannot know the will of God while in this shape. We remain under the jurisdiction of the old taskmaster of the sin capacity. A Christian who gets out from under this taskmaster makes a clean cut break with the momentum of sin. To take orders from the old slave master is to act out of character like wearing a Halloween mask.
Do you think I take hamartia loosely or lightly, sinning with impunity?
What is the 2nd Aorist Billy?
And are you leaving, or "cutting out" the suffering/pascho altogether?
J.