The enemies of freedom do not argue; they shout and they shoot.

Our test is infallible. Whatever view of reality deepens our sense of the tremendous issues of life in the world wherein we move, is for us nearer the truth than any view which diminishes that sense.

If we feel that any habit or pursuit, harmless in itself, is keeping us from God and sinking us deeper in the things of earth; if we find that things which others can do with impunity are for us the occasion of falling, then abstinence is our only course. Abstinence alone can recover for us the real value of what should have been for our help but which has been an occasion of falling. ... It is necessary that we should steadily resolve to give up anything that comes between ourselves and God.

To become a popular religion, it is only necessary for a superstition to enslave a philosophy.

Even the paradise of fools is not an unpleasant abode while it is inhabitable.

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 aim of education is the knowledge, not of facts, but of values.