The most important thing in life is to stop saying 'I wish' and start saying 'I will.'

The development of the vital forms under the influence of external conditions is a subject of the highest importance.

"In science, the credit goes to the man who convinces the world, not to the man to whom the idea first occurs."

和那些叫喊饥饿的人相比，那么吃饱了自然就快乐；和呼叫寒冷的人相比，那么得到温暖自然就快乐；和患病者相比，那么健康就会快乐；和祸患者相比，那么平安就快乐；和死去的人相比，活着就会快乐。