'Know' in the Bible

You know that from your empty way of life inherited from your ancestors you were ransomed -- not by perishable things like silver or gold,

Resist him, strong in your faith, because you know that your brothers and sisters throughout the world are enduring the same kinds of suffering.

Through Silvanus, whom I know to be a faithful brother, I have written to you briefly, in order to encourage you and testify that this is the true grace of God. Stand fast in it.