Now such an objective mystic as this, who is not content with retailing his private experiences and ecstasies, but accepts the great vocation of revealer of Reality, is called upon to do certain things. He must give us, not merely a static picture of Eternity, but also a dynamic ‘reading of life’; and of a life more extended than that which the moralist, or even the philosopher, offers to interpret. He must not only tell us what he thinks about the universe, and in particular that ultimate Spiritual Reality which all mysticism discerns within or beyond the flux. He must also tell us what he thinks of man, that living, moving, fluid spirit-thing: his reactions to this universe and this Reality, the satisfaction which it offers to his thought, will and love, the obligations laid upon him in respect of it. We, on our part, must try to understand what he tells us of these things; for he is, as it were, an organ developed by the race for this purpose—a tentacle pushed out towards the Infinite, to make, in our name and in our interest, fresh contacts with Reality. He performs for us some of the functions of the artist extending our universe, the pioneer cutting our path, the hunter winning food for our souls. The clue to the universe of such a mystic will always be the vision or idea which he has of the Nature of God; and there we must begin, if we would find our way through the tangle of his thought. From this Centre all else branches out, and to this all else must conform, if it is to have for him realness and life; for truth, as Aquinas teaches, is simply the reality of things as they are in God. We begin, then, our exploration of Ruysbroeck’s doctrine by trying to discover the character of his vision of the Divine Nature, and man’s relation with it.