Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe.
Variant: Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
Albert Einstein
A human being is a part of the whole, called by us "Universe," a part limited in time and space. He experiences himself, his thoughts and feelings as something separate from the rest—a kind of optical delusion of his consciousness. The striving to free oneself from this delusion is the one issue of true religion. Not to nourish it but to try to overcome it is the way to reach the attainable measure of peace of mind.
Variant translation: We experience ourselves our thoughts and feelings as something separate from the rest. A kind of optical delusion of consciousness. This delusion is a kind of prison for us, restricting us to our personal desires and to affection for a few persons nearest to us.
Albert Einstein