Men cannot not live by exchanging articles, but producing them. They live by work not trade.

The work of science is to substitute facts for appearances, and demonstrations for impressions.

Nearly all the powerful people of this age are unbelievers, the best of them in doubt and misery, the most in plodding hesitation, doing as well as they can, what practical work lies at hand.

Whether for life or death, do your own work well.

Men were not intended to work with the accuracy of tools, to be precise and perfect in all their actions.