God oftentimes, in his providential dispensations, meets with a man, and speaks particularly to the evil of his heart, as he did to Joseph’s brethren in their selling of him into Egypt. This makes the man reflect on his sin, and judge himself in particular for it. God makes it to be the voice of the danger, affliction, trouble, sickness that he is in or under. Sometimes in reading of the word God makes a man stay on something that cuts him to the heart, and shakes him as to his present condition. More frequently in the hearing of the word preached, his great ordinance for conviction, conversion, and edification, doth he meet with men. God often hews men by the sword of his word in that ordinance, strikes directly on their bosom-beloved lust, startles the sinner, makes him engage unto the mortification and relinquishment of the evil of his heart.
– John Owen –
from The Mortification of Sin in Believers, volume 6 of Works, page 49