This time, it is an act of pennance. I realized yesterday that by constantly trimming and grooming my beard, I was giving in to vanity. To paraphrase Matthew 5:30, "And if your beard causes you to sin, cut it off and throw it away."
I figure I will stay clean-shaven throughout Lent, and we'll take it from there. That will be nearly six weeks, the longest I've been without a beard in years.