The energy available for each individual man is his income, and the philosophy which can teach him to be content with penury should be capable of teaching him also the uses of wealth.

The real value of science is in the getting, and those who have tasted the pleasure of discovery alone know what science is. A problem solved is dead. A world without problems to be solved would be devoid of science.

For a modern ruler the laws of conservation and transformation of energy, when the vivifing stream takes its source, the ways it wends its course in nature, and how, under wisdom and knowledge, it may be intertwined with human destiny, instead of careering headlong to the ocean, are a study at least as pregnant with consequences to life as any lesson taught by the long unscientific history of man.

The pure air and dazzling snow belong to things beyond the reach of all personal feeling, almost beyond the reach of life.

An honest money system is the only alternative.

An inexplicable fact is infinitely preferable to an incomprehensible mystery.

I believe that there have been civilisations in the past that were familiar with atomic energy, and that by misusing it they were totally destroyed.