Sourced

• The survival of the fittest.
  • Herbert Spencer, Principles of Biology, III, ch.12 p.165

Unsourced

• It has yet to be proven that intelligence has any survival value. - Arthur C. Clarke

• Learning is not compulsory... neither is survival. - W. Edwards Deming

• Let every nation know, whether it wishes us well or ill, we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe, to assure the survival and success of liberty. - John F. Kennedy