Last night I revised this old post.

學問は尻からぬけるほたる哉
gakumon wa shiri kara nukeru hotaru kana

great learning
quick to vanish
like the light of a firefly
—Buson

I clarified some parts of the haiku explanation and added a little more about Buson.

If you missed the post the first time around, go give it a read. There is an interesting joke involved with the haiku.

LINK: The Art of Getting Things Done (Haiku-Style): Buson, fireflies, and the fleeting light of learning