'Know' in the Bible

But we know that the law is good if someone uses it legitimately,

But if someone does not know how to manage his own household, how will he care for the church of God?

in case I am delayed, to let you know how people ought to conduct themselves in the household of God, because it is the church of the living God, the support and bulwark of the truth.

They will prohibit marriage and require abstinence from foods that God created to be received with thanksgiving by those who believe and know the truth.