Feel free to post your own.

"Hope is not the conviction that something will turn out well but the certainty that something makes sense, regardless of how it turns out." -- Vaclav Havel

"Your vision will become clear only when you can look into your own heart. Who looks outside, dreams; who looks inside, awakes." -- Carl Jung

"When we long for life without difficulties, remind us that oaks grow strong in contrary winds and diamonds are made under pressure." -- Peter Marshall