'Know' in the Bible

dealing out [full and complete] vengeance to those who do not [seek to] know God and to those who ignore and refuse to obey the gospel of our Lord Jesus [by choosing not to respond to Him].

And you know what restrains him now [from being revealed]; it is so that he will be revealed at his own [appointed] time.

For you yourselves know how you ought to follow our example, because we did not act in an undisciplined or inappropriate manner when we were with you [we were never idle or lazy, nor did we avoid our duties],