This may not be completly motivational, but they do work for this comunity.

"Failure lies not in falling down. Failure lies in not getting up."

"He who asks is a fool for five minutes, but he who does not ask is a fool for ever."

“Excellence is an art won by training and habituation. We do not act rightly because we have virtue or excellence, but we rather have those because we have acted rightly. We are what we repeatedly do. Excellence, then, is not an act but a habit.”