“A man who dares to waste one hour of time has not discovered the value of life.”

“If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once every week.”

“What a book a devil's chaplain might write on the clumsy, wasteful, blundering, low, and horribly cruel work of nature!”

“Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of the higher animals, directly follows. There is gran...”

“One general law, leading to the advancement of all organic beings, namely, multiply, vary, let the strongest live and the weakest die.”

“If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down. Bu...”

“A grain in the balance will determine which individual shall live and which shall die - which variety or species shall increase in number, and which shall decrease, or finally become extinct...”