"True knowledge exists in knowing that you know nothing."
— Socrates (recorded by Plato)
"The only way to do great work is to love what you do."
— Implied in classical thought (commonly echoed)
"Always do right. This will gratify some people and astonish the rest."
— Mark Twain
"In the midst of winter I found there was within me an invincible summer."
— Albert Camus
"Sunlight is the most precious gold to be found on Earth."
— Roman Payne
"Perpetual optimism is a force multiplier."
— Colin Powell
"Know that this world is full of beauty if you have the eyes to see it."
— Louisa May Alcott
"The winds of change whisper that tomorrow holds wonders we cannot yet conceive."
— Pep Talk Radio
"What we achieve inwardly will change outer reality."
— Plutarch
"Sometimes all you can do is laugh."
— M. Price
"I think, therefore I am."
— René Descartes
"Words are the physicians of a mind diseased."
— Aeschylus
"Human nature is the problem, but human nature is also the solution."
— Steven Pinker
"If opportunity doesn't knock, build a door."
— Milton Berle
"Happiness is the meaning and the purpose of life, the whole aim and end of human existence."
— Aristotle (commonly summarized)
"The pain passes, but the beauty remains."
— Pierre-Auguste Renoir
"My optimism and confidence come from visualizing defeat and figuring out how to prevent it."
— Chris Hadfield
"Faith is to believe what you do not see; the reward of this faith is to see what you believe."
— Saint Augustine
"Great things don't come from comfort zones."
— Roy T. Bennett
"Act rather than be acted upon."
— Unknown Stoic aphorism (Stoic ethic)