I also wish thee to look at the Bridge of My only-begotten Son, and see the greatness thereof, for it reaches from Heaven to earth; that is, that the earth of your humanity is joined to the greatness of the Deity thereby. I say, then, that this Bridge reaches from Heaven to earth, and constitutes the union which I have made with man . . . So the height of the Divinity, humbled to the earth, and joined with your humanity, made the Bridge and reformed the road. Why was this done? In order that man might come to his true happiness with the angels. And observe that it is not enough, in order that you should have life, that My son should have made you this Bridge, unless you walk thereon.
St. Catherine of Siena: Dialogues.