"But like that of all beings, its period of existence must come to an end. Once a thought is born and has reached its full growth on the mental plane it will there exist, until what it stands for is shown to be untrue by a mind which gives birth to the thought which takes the place of the one discredited. The one discredited then ceases to exist as an active entity, though its skeleton is kept in the world of thought, much the same as relics or antiques are kept in the world's museums."