'Know' in the Bible

You know this, my dearly-loved brethren. But let every one be quick to hear, slow to speak, and slow to be angry.

Do not be eager, my brethren, for many among you to become teachers; for you know that we teachers shall undergo severer judgement.

You unfaithful women, do you not know that friendship with the world means enmity to God? Therefore whoever is bent on being friendly with the world makes himself an enemy to God.

when, all the while, you do not even know what will happen to-morrow. For what is the nature of your life? Why, it is but a mist, which appears for a short time and then is seen no more.

let him know that he who brings a sinner back from his evil ways will save the man's soul from death and throw a veil over a multitude of sins.