From Dostoevsky’s famous “Brothers Karamozov”:
Much on earth is hidden from us, but to make up for that we have been given a precious mystic sense of our living bond with the other world, with the higher heavenly world, and the roots of our thoughts and feelings are not here but in other worlds. That is why the philosophers say that we cannot apprehend the reality of things on earth. God took seeds from different worlds and sowed them on this earth, and His garden grew up and everything came up that could come up, but what grows lives and is alive only through the feeling of its contact with other mysterious worlds. If that feeling grows weak or is destroyed in you, the heavenly growth will die away in you. Then you will be indifferent to life and even grow to hate it.