"The heart is deceitful above all things, And desperately wicked; Who can know it?
Jeremiah 17:9
Surrounding context
17:8 For he shall be like a tree planted by the waters, Which spreads out its roots by the river, And will not fear when heat comes; But its leaf will be green, And will not be anxious in the year of drought, Nor will cease from yielding fruit.
17:9 "The heart is deceitful above all things, And desperately wicked; Who can know it?
17:10 I, the LORD, search the heart, I test the mind, Even to give every man according to his ways, According to the fruit of his doings.