Give me the critic bred in Nature's school, who neither talks by rote, nor thinks by rule; who feeling's honest dictates still obeys, and dares, without a precedent, to praise.

Work is the true elixir of life. The busiest man is the happiest man. Excellence in any art or profession is attained only by hard and persistent work. Never believe that you are perfect. When a man imagines, even after years of striving, that he has attained perfection, his decline begins.

If every conceivable precaution is taken at first, one is often too discouraged to proceed at all.

Much can often be learned by the repetition under different conditions, even if the desired result is not obtained.

Since, however, it is immaterial whether the work is done by assistants or a machine, I decided to build a machine equivalent to an array of about 200 separating funnels.

القاعدة الذهبية في السجن إن حدث وانتهى بك الأمر خلف قضبانه هي ألا تسأل أي سجين عما أدى به إلى هناك ، إلا إذا أثار هو الموضوع