Now these three things are in a treasure: that which a man loves most and sets the highest price upon and that to which his heart doth retire and seek supply from in all his wants; and every man must be supplied out of his treasure, that I will tell you. Take a rich man when he comes to die, riches avail not in the day of wrath. Therefore God only is the saint's treasure and chief good; he lays up treasure in heaven and this treasure is God.
What is conversion? It's the change of a man's treasure, of a man's chief good. Till thou change thy chief good, it's in vain to complain of the disorders of thy heart; therefore, every unregenerate man may hence see the absolute necessity of conversion.