Answer: D. Invigorate
Explanation: Invigorate: Give strength or energy to something.
The first sentence is that begins with his conscience was clear... and ends with he left all his cares to heaven. That is a common suggestion when one prays, that is, leaving all our cares to heaven. Somewhere the Bible says that we should put our problems in God's hands.
The second sentence confirms the one above. The second sentence begins "in the morning, after he had said his prayers ... "
