Many Christians who hold to Once Saved Always Saved understand it the same as Perseverance of the Saints. The title of this thread
concerns the dangerous abuse of the OSAS where some think once you do that "decision for Christ" at one point of time, and you can later be living like the Devil and thinking you are a regenerate person, or a person who has been "born from above", or "born again".
From The Heidelberg Catechism (1563) as presented online by the Christian Reformed Church in North America, with Scripture Proofs
Q & A 1
Q. What is your only comfort
in life and in death?
A. That I am not my own,1
but belong—
body and soul,
in life and in death—2
to my faithful Savior, Jesus Christ.3
He has fully paid for all my sins with his precious blood,4
and has set me free from the tyranny of the devil.5
He also watches over me in such a way6
that not a hair can fall from my head
without the will of my Father in heaven;7
in fact, all things must work together for my salvation.8
Because I belong to him,
Christ, by his Holy Spirit,
assures me of eternal life9
and makes me wholeheartedly willing and ready
from now on to live for him.10
1 1 Cor. 6:19-20
2 Rom. 14:7-9
3 1 Cor. 3:23; Titus 2:14
4 1 Pet. 1:18-19; 1 John 1:7-9; 2:2
5 John 8:34-36; Heb. 2:14-15; 1 John 3:1-11
6 John 6:39-40; 10:27-30; 2 Thess. 3:3; 1 Pet. 1:5
7 Matt. 10:29-31; Luke 21:16-18
8 Rom. 8:28
9 Rom. 8:15-16; 2 Cor. 1:21-22; 5:5; Eph. 1:13-14
10 Rom. 8:1-17
"Translation © 2011, Faith Alive Christian Resources. This English translation approved by Synod 2011 of the Christian Reformed Church in North America and by General Synod 2011 of the Reformed Church in America."
www.crcna.org
Notice that a Christian's eternal security is not a "once saved always saved" but one of perseverance as written clearly in that last paragraph in the answer to Q1 -
"Because I belong to him, Christ, by his Holy Spirit, assures me of eternal life and makes me wholeheartedly willing and ready from now on to live for him."
*There is a Baptist version of the Heidelberg Catechism by Hercules Collins -