Physics is experience, arranged in economical order.

It would not become physical science to see in its self created, changeable, economical tools, molecules and atoms, realities behind phenomena... The atom must remain a tool for representing phenomena.

Many an article that I myself penned twenty years ago impresses me now as something quite foreign to myself.

Without renouncing the support of physics, it is possible for the physiology of the senses, not only to pursue its own course of development, but also to afford to physical science itself powerful assistance.

Physics is experience, arranged in economical order.

Ordinarily pleasure and pain are regarded as different from sensations.

Man is pre-eminently endowed with the power of voluntarily and consciously determining his own point of view.