I preached at the Monastery on March 4, Lent 2B. The Old Testament lesson was God's promise of a child to Abraham and Sarah. The Gospel was Jesus' prediction of the crucifixion, to which Peter objects, and which earns him the famous rebuke, Get behind me, Satan! In looking for the common link, I thought of the old story of Abba John the Dwarf, whose own abba when he was starting out had him water a stick planted in the ground as a discipline. Pointless, or so it seemed.
The sermon was well received, so I thought I would include a link to it here.