Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.

False facts are highly injurious to the progress of science, for they often endure long but false views, if supported by some evidence, do little harm, for every one takes a salutary pleasure in proving their falseness.

A man who dares to waste one hour of time has not discovered the value of life.

To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact.

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