This evil people, who refuse to hear my words, who walk in the imagination of their heart, and walk after other gods, to serve them, and to worship them, shall even be as this belt, which is good for nothing.

But evil men and seducers shall grow worse and worse, deceiving, and being deceived.

Imagination

But they hearkened not, nor inclined their ear, but walked in the counsels and in the imagination of their evil hearts, and went backward, and not forward.

But have walked after the imagination of their own heart, and after Baalim, which their fathers taught them:

And it comes to pass, when he hears the words of this curse, that he blesses himself in his heart, saying, I shall have peace, though I walk in the imagination of my heart, to add drunkenness to thirst:

For rebellion is as the sin of witchcraft, and stubbornness is as iniquity and idolatry. Because you have rejected the word of the LORD, he has also rejected you from being king.

Evil

The heart is deceitful above all things, and desperately wicked: who can know it?

And God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.

And the LORD smelled a sweet odor; and the LORD said in his heart, I will not again curse the ground any more for man's sake; for the imagination of man's heart is evil from his youth; neither will I again smite any more everything living, as I have done.

Though a sinner does evil a hundred times, and his days are prolonged, yet surely I know that it shall be well with them that fear God, who fear before him:

This is an evil among all things that are done under the sun, that there is one event unto all: yea, also the heart of the sons of men is full of evil, and madness is in their heart while they live, and after that they go to the dead.

For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,

Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.

General references

The heart is deceitful above all things, and desperately wicked: who can know it?