"Every game ever invented by mankind, is a way of making things hard for the fun of it!"

"The only medicine for suffering, crime, and all the other woes of mankind, is wisdom"

"Mankind has grown strong in eternal struggles and it will only perish through eternal peace"

"Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind"

"Fanatics are picturesque, mankind would rather see gestures than listen to reasons"

"I conceive that the great part of the miseries of mankind are brought upon them by false estimates they have made of the value of things"

"The good opinion of mankind, like the lever of Archimedes, with the given fulcrum, moves the world"

"When will mankind be convinced and agree to settle their difficulties by arbitration?"

"The republican is the only form of government which is not eternally at open or secret war with the rights of mankind"

"I abhor war and view it as the greatest scourge of mankind"