It has long been known for sure that the sight of tasty food makes a hungry man’s mouth water; also lack of appetite has always been regarded as an undesirable phenomenon, from which one might conclude that appetite is essentially linked with the process of digestion.

Men are apt to be much more influenced by words than by the actual facts of the surrounding reality.

It is not accidental that all phenomena of human life are dominated by the search for daily bread – the oldest link connecting all living things, man included, with the surrounding nature.

Don’t become a mere recorder of facts, but try to penetrate the mystery of their origin.

Never think that you already know all. However highly you are appraised, always have the courage to say to yourself-I am ignorant.

When the dog is repeatedly teased with the sight of objects inducing salivary secretion from a distance, the reaction of the salivary glands grows weaker and weaker and finally drops to zero.

Men are apt to be much more influenced by words than by the actual facts of the surrounding reality

Perfect as the wing of a bird may be, it will never enable the bird to fly.

Mankind will possess incalculable advantages and extraordinary control over human behavior when the scientific investigator will be able to subject his fellow men to the same external analysis he would employ for any natural object, and when the human mind will contemplate itself not from within but from without.

It is still open to question whether psychology is a natural science, or whether it can be regarded as a science at all.