The church that is married to the spirit of this age, becomes a widow in the next.

The wisdom of the wise is an uncommon degree of common sense.

The vulgar mind always mistakes the exceptional for the important.

Over-population is a phenomenon connected with the survival of the unfit, and it is a mechanism which has created conditions favourable to the survival of the unfit and the elimination of the fit.

Nobody is bored when he is trying to make something that is beautiful or to discover something that is true.

The fruit of the tree of knowledge always drives man from some paradise or other; and even the paradise of fools is not an unpleasant abode while it is habitable.

Events in the past may be roughly divided into those which probably never happened and those which do not matter.