John Calvin was known for his theology called Calvinism; Once Saved Always Saved. Often times the OSAS debate can be difficult unto the Arminius believer or Calvinist. No matter what position that is being taken, either position is not positioning well with each other in theology.

Calvinistic believers tend to be well versed and have responses to these debates, looking over the Jacobus Arminius argument with their scope of understanding; most Calvinist are very adamant about their position. Arminius or Calvin, both positions are well versed.

Calvinist Christians and groups can vary in opinions or on the degrees of Calvinism; below are listed verses used by the majority of them all.

John Calvin

Romans 8:28-30King James Version (KJV)

" And we know that all things work together for good to them that love God, to them who are the called according to his purpose.

29 For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren.

30 Moreover whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified."

Romans 9:11 New American Standard Bible.

" for though the twins were not yet born and had not done anything good or bad, so that God’s purpose according to His choice would stand, not because of works but because of Him who calls,"

Ephesians 1:4-5King James Version (KJV)

"According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love: Having predestinated us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will,"

Jude 1:4 For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ.

Ephesians 2:8-9 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast.

Romans 9:16 ► New International Version
"It does not, therefore, depend on human desire or effort, but on God's mercy."

Theology

Sealed

Until the Day of Redemption

John 6:27 New International Version
"Do not work for food that spoils, but for food that endures to eternal life, which the Son of Man will give you. For on him God the Father has placed his seal of approval."

2 Corinthians 1:21-22King James Version (KJV)

"Now he which stablisheth us with you in Christ, and hath anointed us, is God; Who hath also sealed us, and given the earnest of the Spirit in our hearts."

Revelation 7:3-4 King James Version (KJV)

"Saying, Hurt not the earth, neither the sea, nor the trees, till we have sealed the servants of our God in their foreheads.

4 And I heard the number of them which were sealed: and there were sealed an hundred and forty and four thousand of all the tribes of the children of Israel."

Revelation 9:4 New International Version
"They were told not to harm the grass of the earth or any plant or tree, but only those people who did not have the seal of God on their foreheads."

Ephesians 1:13-14 New International Version
"And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are God’s possession—to the praise of his glory."

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Ephesians 4:30King James Version (KJV)

"And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption."