"The whole future lies in uncertainty: live immediately."

"What man can you show me who places any value on his time, who sets a daily price on each day, who understands that he is dying daily?"

"The part of life we really live is small. For all the rest of existence is not life, but merely time."

"It is the power of the mind to be unconquerable."

"Religion is regarded by the common people as true, by the wise as false, and by rulers as useful."