"The world of sense experience is not the only world."

"The human mind is capable of understanding the universe."

"When we consider the development of science, we cannot help noticing that it is in many places the work of individuals who, in opposition to the general current of their time, have succeeded in imposi…"

"We have no right to assume that any physical laws exist, or if they have existed up to now, that they will continue to exist in a similar manner in the future."

"The quantum theory is a theory of the greatest simplicity and beauty."