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.

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.

There is no limit to the noble aspirations which the words "my country" may evoke.

No Christian can be a pessimist, for Christianity is a system of radical optimism.

No healthy civilization can ever be reared on a foundation of devitalized work.

Man, as we know him, is a poor creature; he is halfway between an ape and a god and he is travelling in the right direction.

Experience proves that none is so cruel as the disillusioned sentimentalist.