Man never had an idea - man will never have an idea, except those supplied to him by his surroundings. Every idea in the world that man has came to him by nature.
Courage without conscience is a wild beast.
Hope is the only universal liar who never loses his reputation for veracity.
There is no common sense in going to the field to fight and leaving a man at home to undo all that you accomplish.
There can be but little liberty on earth while men worship a tyrant in heaven.
Reason, observation, and experience; the holy trinity of science.