“It always seems impossible until it's done.” — Nelson Mandela · widely attributed, various speeches post-1990
“The man who moves a mountain begins by carrying away small stones.” — Confucius · attributed to Confucius, various collections
“If you have faith as small as a mustard seed, you can say to this mountain, 'Move from here to there,' and it will move.” — Jesus of Nazareth · Matthew 17:20, New International Version
“Life is 10% what happens to you and 90% how you react to it.” — Charles R. Swindoll · Strengthening Your Grip, 1982
“Perseverance is not a long race; it is many short races one after the other.” — Walter Elliot · The Spiritual Life