The question is not so much whether there is life on Mars as whether it will continue to be possible to live on Earth
Ingratitude is the essence of vileness.
Freedom can never be comprehended, nor even can insight into it be gained.
Three things tell a man: his eyes, his friends and his favorite quotes
Nature does nothing in vain, and in the use of means to her goals she is not prodigal.
Do what is right, though the world may perish.