There is no result in nature without a cause; understand the cause and you will have no need of the experiment.

Leonardo da Vinci

Experiment is the sole interpreter of the artifices of Nature.

Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity.

Men and nature must work hand in hand. The throwing out of balance of the resources of nature throws out of balance also the lives of men.

Nature knows no indecencies; man invents them.

What a book a devil's chaplain might write on the clumsy, wasteful, blundering, low, and horribly cruel work of nature!

Man selects only for his own good: Nature only for that of the being which she tends.

Dalai LamaSpiritual Leader

Elon MuskBusinessman