I have never seen the slightest scientific proof of the religious ideas of heaven and hell, of future life for individuals, or of a personal God. - Thomas Edison

I am proud of the fact that I never invented weapons to kill.

Nature is what we know. We do not know the gods of religions. And nature is not kind, or merciful, or loving. If God made me — the fabled God of the three qualities of which I spoke: mercy, kindness, love — He also made the fish I catch and eat. And where do His mercy, kindness, and love for that fish come in? No; nature made us — nature did it all — not the gods of the religions

To do much clear thinking a person must arrange for regular periods of solitude when they can concentrate and indulge the imagination without distraction.