The wonder of nature does not become smaller because one cannot measure it by the standards of human moral and human aims.

Without the sense of fellowship with men of like mind... life would have seemed to me empty.

All of us who are concerned for peace and triumph of reason and justice must be keenly aware how small an influence reason and honest good will exert upon events in the political field.

You imagine that I look back on my life's work with calm satisfaction. But from nearby it looks quite different. There is not a single concept of which I am convinced that it will stand firm, and I feel uncertain whether I am in general on the right track.

What use are socks? They only produce holes.

A perfection of means, and confusion of aims, seems to be our main problem.

For the moral attitudes of a people that is supported by religion need always aim at preserving and promoting the sanity and vitality of the community and its individuals, since otherwise this community is bound to perish. A people that were to honour falsehood, defamation, fraud, and murder would be unable, indeed, to subsist for very long.