'Knowing' in the Bible

but knowing that a man is not justified on the principle of works of law nor but by the faith of Jesus Christ, we also have believed on Christ Jesus, that we might be justified on the principle of the faith of Christ; and not of works of law; because on the principle of works of law no flesh shall be justified.

But then indeed, not knowing God, ye were in bondage to those who by nature are not gods;

but now, knowing God, but rather being known by God, how do ye turn again to the weak and beggarly principles to which ye desire to be again anew in bondage?