'Know' in the Bible

Now I want you to know, brothers and sisters, that the gospel I preached is not of human origin.

yet we know that no one is justified by the works of the law but by the faithfulness of Jesus Christ. And we have come to believe in Christ Jesus, so that we may be justified by the faithfulness of Christ and not by the works of the law, because by the works of the law no one will be justified.

Formerly when you did not know God, you were enslaved to beings that by nature are not gods at all.

But now that you have come to know God (or rather to be known by God), how can you turn back again to the weak and worthless basic forces? Do you want to be enslaved to them all over again?

But you know it was because of a physical illness that I first proclaimed the gospel to you,