Catastrophes come when some dominant institution, swollen like a soap-bubble and still standing without foundations, suddenly crumbles at the touch of what may seem a word or idea, but is really some stronger material source.

It is true that I am carrying out various methods of treatment recommended by doctors and dentists in the hope of dying in the remote future in perfect health.

There is nothing to which men, while they have food and drink, cannot reconcile themselves.

There is wisdom in turning as often as possible from the familiar to the unfamiliar: it keeps the mind nimble, it kills prejudice, and it fosters humor.

The works of nature first acquire a meaning in the commentaries they provoke.

The scientific value of truth is not, however, ultimate or absolute. It rests partly on practical, partly on aesthetic interests. As our ideas are gradually brought into conformity with the facts by the painful process of selection,-for intuition runs equally into truth and into error, and can settle nothing if not controlled by experience,-we gain vastly in our command over our environment. This is the fundamental value of natural science

A dream is always simmering below the conventional surface of speech and reflection.