The chemist takes certain chemicals and certain results are produced. This is a fact; you see it, sense it, and make that the basis on which to build all your chemical arguments. So with the physicists, so with all other sciences. All knowledge must stand on perception of certain facts, and upon that we have to build our reasoning. But, curiously enough the vast majority of mankind think, especially at the present time, that no such perception is possible in religion, that religion can only be apprehended by vain arguments. Therefore we are told not to disturb the mind by vain arguments. Religion is a question of fact, not of talk. We have to analyse our own souls and to find what is there. We have to understand it and to realise what is understood. That is religion. No amount of talk will make religion. So the question whether there is a God or not can never be proved by argument, for the arguments are as much on one side as on the other. But if there is a God, He is in our own hearts. Have you ever seen Him? The question as to whether this world exists or not has not yet been decided, and the debate between the idealists and the realists is endless. Yet we know that the world exists, that it goes on. We only change the meaning of words. So, with all the questions of life, we must come to facts.