Thus saith the LORD of hosts, Hearken not unto the words of the prophets that prophesy unto you: they make you vain: they speak a vision of their own heart, and not out of the mouth of the LORD.
They make you vain - they seduce you to vanity - i:e., idolatry, which will prove a vain trust to you (Jeremiah 2:5; 2 Kings 17:15; Jonah 2:8). (Gesenius.) Rather, 'they delude you with vain promises of security' (Jeremiah 23:17); (cf. Psalms 62:10). (Maurer)
The imagination of his own heart - of their own invention (Jeremiah 23:21; Jeremiah 14:14).