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.

In scientific work, those who refuse to go beyond fact rarely get as far as fact.

There is but one right, and the possibilities of wrong are infinite.

Some experience of popular lecturing had convinced me that the necessity of making things plain to uninstructed people, was one of the very best means of clearing up the obscure corners in one's own mind.

The man of science has learned to believe in justification, not by faith, but by verification.

Within the last fifty years, the extraordinary growth of every department of physical science has spread among us mental food of so nutritious and stimulating a character that a new ecdysis seems imminent.

There is no sadder sight in the world than to see a beautiful theory killed by a brutal fact.