The scientific attitude of mind involves a sweeping away of all other desires in the interest of the desire to know.

All the time that he can spare from the adornment of his person, he devotes to the neglect of his duties.

One of the chief obstacles to intelligence is credulity, and credulity could be enormously diminished by instructions as to the prevalent forms of mendacity. Credulity is a greater evil in the present day than it ever was before, because, owing to the growth of education, it is much easier than it used to be to spread misinformation, and, owing to democracy, the spread of misinformation is more important than in former times to the holders of power.

All who are not lunatics are agreed about certain things : That it is better to be alive than dead, better to be adequately fed than starved, better to be free than a slave

Science is what we know, and philosophy is what we don't know.

Love and knowledge led upwards to the heavens.

The most essential characteristic of scientific technique is that it proceeds from experiment, not from tradition.