Skepticism is not an end in itself; it is a tool for the discovery of truths.

This is a lesson mankind has not yet learned. We identify, and stratify, and treat persons largely on the basis of their accidental (physical) characteristics, which have no deeper meaning.

Real loneliness consists not in being alone, but in being with the wrong person, in the suffocating darkness of a room in which no deep communication is possible.

Nobody can be so amusingly arrogant as a young man who has just discovered an old idea and thinks it is his own.

The generality of mankind is lazy. What distinguishes men of genuine achievement from the rest of us is not so much their intellectual powers and aptitudes as their curiosity, their energy, their fullest use of their potentialities. Nobody really knows how smart or talented he is until he finds the incentives to use himself to the fullest. God has given us more than we know what to do with.

Middle Age is that perplexing time of life when we hear two voices calling us, one saying, 'Why not?' and the other, 'Why bother?'

The real heretic is not the atheist or agnostic (who are often decent people) but those who murmur "it doesn't matter what you believe, as long as it makes you feel good." This turns religion into a subjective matter, like taste in furnishings, and robs theology of its claim to ultimate truth.