In truth, the laboratory is the forecourt of the temple of philosophy, and whoso has not offered sacrifices and undergone purification there has little chance of admission into the sanctuary.

Teach a man to read and write, and you have put into his hands the great keys of the wisdom-box.

Education is the instruction of the intellect in the laws of Nature.

Of moral purpose I see no trace in Nature. That is an article of exclusively human manufacture and very much to our credit.

Proclaim human equality as loudly as you like, Witless will serve his brother.

Science commits suicide when it adopts a creed.

There is no alleviation for the sufferings of mankind except veracity of thought and of action, and the resolute facing of the world as it is when the garment of make-believe by which pious hands have hidden its uglier features is stripped off.