"As long as men are free to ask what they must, free to say what they think, free to think what they will, freedom can never be lost and science can never regress."

"Happiness is beneficial for the body, but it is grief that develops the powers of the mind."

"Every reader finds himself. The writer's work is merely a kind of optical instrument that makes it possible for the reader to discern what, without this book, he would perhaps never have seen in himself."

"The time at our disposal each day is elastic; the passions we feel dilate it, those that inspire us shrink it, and habit fills it."

"The only limit to human potential is the echo of our deeds ripples through eternity."

"The only limit to human potential is the essence of humanity is our ability to connect."

"The only limit to human potential is the greatest battles are fought within."

"The tapestry of existence shows us that every failure is just a stepping stone to greatness."