The wise are instructed by reason, average minds by experience, the stupid by necessity and the brute by instinct.Cicero
When superstition is allowed to perform the task of old age in dulling the human temperament, we can say goodbye to all excellence in poetry, in painting, and in music.Denis Diderot
There are three principal means of acquiring knowledge... observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination.Denis Diderot
In order to shake a hypothesis, it is sometimes not necessary to do anything more than push it as far as it will go.Denis Diderot