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If man doesn't learn to treat the oceans and the rain forest with respect, man will become extinct.

He who is without a newspaper is cut off from his species.

Extinction is the rule. Survival is the exception.

He who has so little knowledge of human nature as to seek happiness by changing anything but his own disposition will waste his life in fruitless efforts.

Most evolving lineages, human or otherwise, when threatened with extinction, don't do anything special to avoid it.

He who is unconscious of the ties which connect him with every individual of his species feels no obligation to make sacrifices for their welfare or happiness.

It is in his knowledge that man has found his greatness and his happiness, the high superiority which he holds over the other animals who inhabit the earth with him, and consequently no ignorance is probably without loss to him, no error without evil.

Man must cease attributing his problems to his environment, and learn again to exercise his will - his personal responsibility in the realm of faith and morals.

He who asks of life nothing but the improvement of his own nature... is less liable than anyone else to miss and waste life.