As long as men are free to ask what they must, free to say what they think, free to think what they will, freedom can never be lost and science can never regress.

Almost everything that distinguishes the modern world from earlier centuries is attributable to science, which achieved its most spectacular triumphs in the seventeenth century.

Art is the tree of life. Science is the tree of death.

Natural science will in time incorporate into itself the science of man, just as the science of man will incorporate into itself natural science: there will be one science.

Science in the modern world has many uses its chief use, however, is to provide long words to cover the errors of the rich.