An inexplicable fact is infinitely preferable to an incomprehensible mystery.

It is curious to reflect, for example, upon the remarkable legend of the Philosopher's Stone, one of the oldest and most universal beliefs, the origin of which, however far back we penetrate into the records of the past, we do not probably trace its real source.

The whole profit of the issuance of money has provided the capital of the great banking business as it exists today.

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.

Heat energy of uniform temperature [is] the ultimate fate of all energy. The power of sunlight and coal, electric power, water power, winds and tides do the work of the world, and in the end all unite to hasten the merry molecular dance.

There has been no discovery like it in the history of man. It puts into man's hands the key to using the fundamental energy of the universe.

With all our mastery over the powers of Nature we have adhered to the view that the struggle for existence is a permanent and necessary condition of life.