The medieval university looked backwards; it professed to be a storehouse of old knowledge. The modern university looks forward, and is a factory of new knowledge.
The scientific spirit is of more value than its products, and irrationally held truths may be more harmful than reasoned errors.
There is the greatest practical benefit in making a few failures early in life.
The ultimate court of appeal is observation and experiment... not authority.
The world is neither wise nor just, but it makes up for all its folly and injustice by being damnably sentimental.
There is but one right, and the possibilities of wrong are infinite.
There is no sea more dangerous than the ocean of practical politics none in which there is more need of good pilotage and of a single, unfaltering purpose when the waves rise high.
Time, whose tooth gnaws away everything else, is powerless against truth.
Science has fulfilled her function when she has ascertained and enunciated truth.
The scientific imagination always restrains itself within the limits of probability.
Surely there is a time to submit to guidance and a time to take one's own way at all hazards.
Science is organized common sense where many a beautiful theory was killed by an ugly fact.
Science is nothing, but trained and organized common sense.
Science reckons many prophets, but there is not even a promise of a Messiah.
The man of science has learned to believe in justification, not by faith, but by verification.