Indeed, the great Leonardo (da Vinci) remained like a child for the whole of his life in more than one way. It is said that all great men are bound to retain some infantile part. Even as an adult he continued to play, and this was another reason why he often appeared uncanny and incomprehensible to his contemporaries.

Demons do not exist any more than gods do, being only the products of the psychic activity of man.

The meager satisfaction that man can extract from reality leaves him starving.

Poets are masters of us ordinary men, in knowledge of the mind, because they drink at streams which we have not yet made accessible to science.

I cannot think of any need in childhood as strong as the need for a father's protection.

The study of dreams may be considered the most trustworthy method of investigating deep mental processes. Now dreams occurring in traumatic neuroses have the characteristic of repeatedly bringing the patient back into the situation of his accident, a situation from which he wakes up in another fright.

Properly speaking, the unconscious is the real psychic; its inner nature is just as unknown to us as the reality of the external world, and it is just as imperfectly reported to us through the data of consciousness as is the external world through the indications of our sensory organs.