537.M3 538.M1
These two meditations are both wonderful food for most souls. The first is on being fully alive, and the second is about wanting to do God's will willingly.
I would have to point out that the part about 'commanding the soul to do his bidding' doesn't really seem 'optional' (as in I don't see anyone who is evidencing being the incarnation of something *else* besides God).
The hard part (for me) is seeing the evil people who do God's work. I understand that this is His will, but still, one is judged by the company one keeps.
All those people (bit characters, no lines) in Job who participated, for example. The one who brought the infections, for instance. Certainly they were doing God's will (and perhaps willingly).
It turned out kinda sucky for Job, though.