'Know' in the Bible

But at that time [when you] did not know God, you were enslaved to the things which by nature are not gods.

But now, [because you] have come to know God, or rather have come to be known by God, how can you turn back again to the weak and miserable elemental spirits? Do you want to be enslaved to them all over again?

But you know that because of an illness of the flesh I proclaimed the gospel to you the first time.