It is reflections of this kind which vanquish devils. But, oh, my God and Lord, how everything is ruined by the vain habits we fall into and the way everyone else follows them! So dead is our faith that we desire what we see more than what faith tells us about -- though what we actually see is that people who pursue these visible things meet with nothing but ill fortune. All this is the work of these poisonous creatures which we have been describing. For, if a man is bitten by a viper, his whole body is poisoned and swells up; and so it is in this case, and yet we take no care of ourselves. Obviously a great deal of attention will be necessary if we are to be cured and only the great mercy of God will preserve us from death. The soul will certainly suffer great trials at this time, especially if the devil sees that its character and habits are such that it is ready to make further progress: all the powers of hell will combine to drive it back again.