I thought that continence was a matter of our own strength, and I knew that I had not the strength: for in my utter foolishness I did not know the word of Your Scripture that none can be continent unless You give it.
The same divine authority that forbids the killing of a human being establishes certain exceptions, as when God authorizes killing by a general law or when He gives an explicit commission to an individual for a limited time.
Someone who knows enough to become the owner of a tree, and gives thanks to you for the benefits it brings him, is in a better state, even if ignorant of its height in feet and the extent of its spread, than another who measures and counts all its branches but neither owns it nor knows its creator nor loves him.
Give what You command and command what You will.