Simple in himself, the Spirit is manifold in his mighty works. The whole of his being is present to each individual; the whole of his being is present everywhere. Though shared in by many, he remains unchanged; his self-giving is no loss to himself. Like the sunshine, which permeates all the atmosphere, spreading over land and sea, and yet is enjoyed by each person as though it were for him alone, so the Spirit pours forth his grace in full measure, sufficient for all, and yet is present as though exclusively to everyone who can receive him. To all creatures that share in him he gives a delight limited only by their own nature, not by his ability to give.
–Saint Basil the Great (330-379)