“Many are the plans in the heart of a man, but the counsel of Jehovah is what will stand.”—Prov. 19:21.
... 8. How does the Bible describe the ability of the heart to choose the course one will take?
8 This ability of the heart to select between optional courses and fix its desire on one of them explains why the Bible speaks of the heart of man as ‘making plans’ and as ‘thinking out his way,’ that is, the way over which his mind has first thought and which way appeals to his heart. (Prov. 19:21; 16:9)