The heart — There is nothing so false and deceitful as the heart of man; deceitful in its apprehensions of things, in the hopes and promises which it nourishes, in the assurances that it gives us; unsearchable by others, deceitful with reference to ourselves, and abominably wicked, so that neither can a man know his own heart, nor can any other know that of his neighbour's.
Related Commentaries of Jeremiah 17:9
Jeremiah 17:9
9 The heart is deceitful above all things, and desperately wicked: who can know it?