Jeremiah 9:6

"Deceit" so typified their environment that it prevented them from having much of a relationship with Yahweh. Note the recurrence of "deceit" and its synonyms in this pericope. They did not know God (Jeremiah 9:3), and they refused to know Him. Even while they devotedly studied deception (Jeremiah 9:5), they refused to "know" Him.

"The verb yada’, ’know,’ denotes much more than intellectual knowledge but rather that deep intimate knowledge that follows on the personal commitment of one life to another, which is at its deepest in the commitment of a man to God [cf. Amos 3:2]." [Note: Thompson, p. 310.]