The Only Condition is the faithfulness of the Lord Jesus, so far as continued salvation is concerned.
Rom 4:16
For this cause it is of faith, that it may be according to grace; to the end that the promise may be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham, who is the father of us all
End of Rom 8:
And we know that to them that love God all things work together for good, even to them that are called according to his purpose. For whom
he foreknew,
he also foreordained to be conformed to the image of his Son, that he might be the firstborn among many brethren: and whom
he foreordained, them
he also called: and whom he called, them he also justified: and whom
he justified, them
he also glorified.
What then shall we say to these things? If God is for us, who is against us? He who spared not his own Son, but delivered him up for us all, how shall he not also with him freely give us all things?
Who shall lay anything to the charge of God’s elect? It is God who justifies;
who is he who condemns?
It is Christ Jesus that died, yea rather, that was raised from the dead, who is at the right hand of God, who also makes intercession for us.
Who shall separate us from the love of Christ? shall tribulation, or anguish, or persecution, or famine, or nakedness, or peril, or sword? Even as it is written,
For thy sake we are killed all the day long;
We were accounted as sheep for the slaughter.
Nay, in all these things we are more than conquerors through him that loved us. For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor things present, nor things to come, nor powers, nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.
1 Peter
Blessed be the God and Father of our Lord Jesus Christ, who according to his great mercy begat us again unto a living hope by the resurrection of Jesus Christ from the dead, to an inheritance incorruptible, and undefiled, and that fadeth not away, reserved in heaven for you, who by the power of God are guarded through faith unto a salvation ready to be revealed in the last time.
Thou shalt call His name Jesus; for
He shall save His people from their sins.
The gifts & the calling of God are irrevocable.
I give them eternal life, and they shall never perish.