Man has lost the capacity to foresee and to forestall. He will end by destroying the earth. – Albert Schweitzer, quoted in James Brabazon, Albert Schweitzer

The control man has secured over nature has far outrun his control over himself. – Ernest Jones, The Life and Work of Sigmund Freud, 1953

Every experience in life, everything with which we have come in contact in life, is a chisel which has been cutting away at our life statue, molding, modifying, shaping it. We are part of all we have met. Everything we have seen, heard, felt or thought has had its hand in molding us, shaping us. – Orison Swett Marden

The human race will be the cancer of the planet. – Julian Huxley, attributed