"All men are selfish, but the vain man is in love with himself. He admires, like the lover his adored one, everything which to others is indifferent."
"Discontent is the source of all trouble, but also of all progress in individuals and in nations."
"Garden work consists more in uprooting weeds than in planting seed. This applies also to teaching."
"Only he is free who cultivates his own thoughts... and strives without fear of man to do justice to them."
"What people will say - in these words there lies the tyranny of the world, the whole destruction of our natural disposition, the oblique vision of our minds. These four words bear sway everywhere."