'Know' in the Bible

Ye know this , my beloved brethren. But let every man be swift to hear, slow to speak, slow to wrath:

But wilt thou know, O vain man, that faith apart from works is barren?

Ye adulteresses, know ye not that the friendship of the world is enmity with God? Whosoever therefore would be a friend of the world maketh himself an enemy of God.

whereas ye know not what shall be on the morrow. What is your life? For ye are a vapor, that appeareth for a little time, and then vanisheth away.

let him know, that he who converteth a sinner from the error of his way shall save a soul from death, and shall cover a multitude of sins.