“Men love to wonder, and that is the seed of our science.”

“You can never do a kindness too soon, for you never know how soon it will be too late.”

“The imitator dooms himself to hopeless mediocrity.”

“Give me health and a day, and I will make the pomp of emperors ridiculous.”

“What is a weed? A plant whose virtues have yet to be discovered.”

“To different minds, the same world is a hell, and a heaven.”

“A happy life consists not in the absence, but in the mastery of hardships.”

“No doubt the reason is that character cannot be developed in ease and quiet. Only through experience of trial and suffering can the soul be strengthened, vision cleared, ambition inspired, and success achieved.”

“Believe, when you are most unhappy, that there is something for you to do in the world. So long as you can sweeten another's pain, life is not in vain.”

“You gain strength, courage, and confidence by every experience in which you really stop to look fear in the face. You are able to say to yourself, 'I have lived through this horror. I can take the next thing that comes along.' You must do the thing you think you cannot do.”

“You must not lose faith in humanity. Humanity is an ocean; if a few drops of the ocean are dirty, the ocean does not become dirty.”

“Strength does not come from physical capacity. It comes from an indomitable will.”