Time is what the clock says.

Success comes from curiosity, concentration, perseverance and self criticism.

All the fifty years of conscious brooding have brought me no closer to answer the question, "What are light quanta?" Of course today every rascal thinks he knows the answer, but he is deluding himself.

I have never obtained any ethical values from my scientific work.

Non-cooperation in military matters should be an essential moral principle for all true scientists.

I have yet to meet a single person from our culture, no matter what his or her educational background, IQ, and specific training, who had powerful transpersonal experiences and continues to subscribe to the materialistic monism of Western science.

If the believers of the present-day religions would earnestly try to think and act in the spirit of the founders of these religions then no hostility on the basis of religion would exist among the followers of the different faiths. Even the conflicts and the realm of religion would be exposed as insignificant.