The only thing that makes life possible is permanent, intolerable uncertainty; not knowing what comes next.

Ursula K. LeGuin

The greater the artist, the greater the doubt. Perfect confidence is granted to the less talented as a consolation prize.

Robert Hughes

The worst feeling in life is to not know what's going to happen next.

Shaquille Solomon

Without suffering and doubts, the mind will come to rest on cliches and stay there, until the spirit dies as well.

Robert Greene

The past is gone, never to come back. Whatever you did or could not do is history; you cannot go back in time to do or undo it. Brooding on the past is futile, so is being anxious about future. Focus on what you can do in the present because the present is creating your future.

The Ancient Sage

You're tired and scared. Happens to everyone, okay? Just don't let your feet stop.

Haruki Murakami