It enhances and livens up food. There is no mistaking it when the cook accidentally leaves out the required amount of salt. Hospital patients are sometimes put on a low salt diet, and most people experience the loss of the salt-flavoring as a huge sacrifice. Food loses its zest without salt. Light has something of the same quality.
Light is utterly distinct from darkness.
Even the tiniest candle in a dark room can be seen at once. It livens up the atmosphere. Without light, a life becomes dark and dreary. A city set on a hill adds a sparkle to the landscape. The English novelist Rudyard Kipling married an American woman, and spent some years living on a farm in Vermont.