T.t.t.
Put up in a place
where it’s easy to see
the cryptic admonishment
T.T.T.
When you feel how depressingly
slowly you climb,
it’s well to remember that
Things Take Time.
Piet Hein
Piet Hein (1905-1996): A Danish scientist, mathematician, inventor, and poet. He is best known for his "grooks," or short philosophical poems that often feature wordplay and paradoxical ideas.