St. Monica is one example of the power of persistent prayer. Her husband reportedly converted to Christianity on his deathbed and we know, of course, about the conversion of her famous son Augustine. I like this statue of her, because even though the opening prayer at this morning's mass invoked her many tears, it doesn't show her crying or sorrowful, but determined and resolute. According to Augustine's account, Monica was privileged with at least one experience of mystical prayer. Persistent prayer can be its own reward.