'The trial did not create the evil: it merely brought out what was there already, unoticed and unfelt, like a torpid adder. Then the heart's deep fountains were broken up, and streams of pollution came rushing out, black as Hell ... Even so it is with the saints still. God chastens them that He may draw forth the evil that is lying concealed and unsuspected within ... When calamity breaks over them like a tempest, then the hidden evils of their heart awakes.'
Horatius Bonar in Tim Chester, You Can Change, p.160.