“Man is a work of nature; he exists in nature; he is submitted to her laws; he cannot deliver himself from them; nor can he step beyond them even in thought.”
Baron d'Holbach
3 quotes in the MindQuotes library.
“To be happy, man must be free; to be free, he must be enlightened; to be enlightened, he must have the courage to think for himself.”
“The source of man's unhappiness is his ignorance of nature.”