Riches may enable us to confer favours, but to confer them with propriety and grace requires a something that riches cannot give.

Be very slow to believe that you are wiser than all others; it is a fatal but common error

Fight for your opinions, but do not believe that they contain the whole truth, or the only truth.

In the state of nature, indeed, all men are born equal, but they cannot continue in this equality. Society makes them lose it, and they recover it only by the protection of the laws.

An inventor is simply a fellow who doesn't take his education too seriously.

Men should be like Kleenex, soft, strong and disposable.