His soul hasn't anything to do with it.

How can he be tempted to get drunk and refuse to get drunk?
If the desire to remain sober prevails, it is because it is the strongest desire.
Temptation plays no part, unless--" he paused while grasping the new thought which had come into his mind--"unless he is tempted to remain sober.
"Ha! ha!" he laughed.

"What do you think of that, Mr.Van Weyden ?" "That both of you are hair-splitting," I said.

"The man's soul is his desires.

Or, if you will, the sum of his desires is his soul.