"I think that we should look at things always from a higher point of view, and see them in their true proportions."

"If you want to live a happy life, tie it to a goal, not to people or objects."

"The only source of knowledge is experience."

"Genius is one percent inspiration and ninety-nine percent perspiration."

"Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful."

"The world is my country, all mankind are my brethren, and to do good is my religion."