The Heart of a Man by Nature is like a Garrison

The heart and sin are like two lovers who cannot endure to be parted. . . The heart of a man by nature is like a garrison which holds out in war. Though articles of peace are offered, though it is straightly besieged and one bullet after another is shot, yet the garrison holds out. So the heart is a garrison that holds out against God. Though He uses entreaties, gives warnings, shoots bullets into the conscience, yet the garrison of the heart holds out. The man will not be reclaimed; he sins still. He is said to have a brow of brass, in regard to his impudence, and a sinew of iron, in regard to his obstinance, Isa. 48:4. “Mischief of Sin” pgs. 55-56