10 “No man has seen God at any time:” He is a thing invisible; not with the eye but with the heart must He be sought. But just as if we wished to see the sun, we should purge the eye of the body; wishing to see God, let us purge the eye by which God can be seen. Where is this eye? Hear the Gospel: “Blessed are the pure in heart, for they shall see God.” But let no man imagine God to himself according to the lust of his eyes. For so he makes unto himself either a huge form, or a certain incalculable magnitude which, like the light which he sees with the bodily eyes, he makes extend through all directions; field after field of space he gives it all the bigness he can; or, he represents to himself like as it were an old man of venerable form.
None of these things do you imagine. There is something you may imagine, if you would see God; “God is love.” What sort of face has love? What form has it? What stature? What feet? What hands has it? No man can say. And yet it has feet, for these carry men to church: it has hands; for these reach forth to the poor: it has eyes; for thereby we consider the needy: “Blessed is the man,” it is said, “who considers the needy and the poor.” It has ears, of which the Lord says, “He that has ears to hear let him hear.” These are not members distinct by place, but with the understanding he that has charity sees the whole at once.
Inhabit, and you shall be inhabited; dwell, and you shall be dwelt in. For how say you, my brethren? Who loves what he does not see? Now why, when charity is praised, do ye lift up your hands, make acclaim, praise? What have I shown you? What I produced, was it a gleam of colors? What I propounded, was it gold and silver? Have I dug out jewels from hid treasures? What of this sort have I shown to your eyes? Is my face changed while I speak? I am in the flesh; I am in the same form in which I came forth to you; you are in the same form in which you came hither: charity is praised, and you shout applause.
Certainly ye see nothing. But as it pleases you when you praise, so let it please you that you may keep it in your heart. For mark well what I say brethren; I exhort you all, as God enables me, unto a great treasure. If there were shown you a beautiful little vase, embossed, inlaid with gold, curiously wrought, and it charmed your eyes, and drew towards it the eager desire of your heart, and you were pleased with the hand of the artificer, and the weight of the silver, and the splendor of the metal; would not each one of you say, “O, if I had that vase!”
And to no purpose ye would say it, for it would not rest with you to have it. Or if one should wish to have it, he might think of stealing it from another's house. Charity is praised to you; if it please you, have it, possess it: no need that you should rob any man, no need that you should think of buying it; it is to be had freely, without cost. Take it, clasp it; there is nothing sweeter. If such it be when it is but spoken of, what must it be when one has it?
Source: Homilies on the First Epistle of John (New Advent)