Human life is proverbially uncertain; few things are more certain than the solvency of a life-insurance company.

Science is one thing, wisdom is another. Science is an edged tool, with which men play like children, and cut their own fingers.

Something unknown is doing we don't know what-that is what our theory amounts to.

Oh leave the Wise our measures to collate. One thing at least is certain, light has weight. One thing is certain and the rest debate. Light rays, when near the Sun, do not go straight.

Human life is proverbially uncertain; few things are more certain than the solvency of a life-insurance company.

Don't believe the results of experiments until they're confirmed by theory.

Whether in the intellectual pursuits of science or in the mystical pursuits of the spirit, the light beckons ahead, and the purpose surging in our nature responds.