For those who believe, no proof is necessary. For those who don't believe, no proof is possible.
Life, Religion, God
People above the line of bare subsistence in this age, and in all earlier ages, do not use the surplus which society has given them primarily for useful purposes. They do not seek to expand their lives, to live more wisely, intelligently, understandingly, but to impress other people with the fact that they have a surplus.
Society, Wealth