'Remain' in the Bible

What shall we say then? Are we to remain in sin so that grace may increase?

(for they being not yet born, neither having done anything good or evil, that the purpose of God, according to choice, might remain; not of works, but of Him who is calling,) it was said to her --

"Lord, they have put Thy Prophets to death, and have overthrown Thy altars; and, now that I alone remain, they are thirsting for my blood"?

That's right! They were broken off because of their unbelief, but you remain only because of faith. Do not be arrogant, but be afraid!

Therefore, consider God’s kindness and severity: severity toward those who have fallen but God’s kindness toward you—if you remain in His kindness. Otherwise you too will be cut off.

And even they, if they do not remain in unbelief, will be grafted in, because God has the power to graft them in again.