“Religion it self is nothing else but Love to God and Man. He that lives in Love lives in God, says the Beloved Disciple: And to be sure a Man can live no where better.”

Entry in Tolstoy's Diary http://www.linguadex.com/tolstoy/chapter1.htm (1 November 1910)
Context: God is the infinite ALL. Man is only a finite manifestation of Him.
Or better yet:
God is that infinite All of which man knows himself to be a finite part.
God alone exists truly. Man manifests Him in time, space and matter. The more God's manifestation in man (life) unites with the manifestations (lives) of other beings, the more man exists. This union with the lives of other beings is accomplished through love.
God is not love, but the more there is of love, the more man manifests God, and the more he truly exists...
We acknowledge God only when we are conscious of His manifestation in us. All conclusions and guidelines based on this consciousness should fully satisfy both our desire to know God as such as well as our desire to live a life based on this recognition.

The Building of the City Beautiful (1905), Ch. V : How Beautiful!, p. 48.

Source: What Men Live By (1881), Ch. XII
Context: And the angel's body was bared, and he was clothed in light so that eye could not look on him; and his voice grew louder, as though it came not from him but from heaven above. And the angel said:
I have learnt that all men live not by care for themselves, but by love.
It was not given to the mother to know what her children needed for their life. Nor was it given to the rich man to know what he himself needed. Nor is it given to any man to know whether, when evening comes, he will need boots for his body or slippers for his corpse.
I remained alive when I was a man, not by care of myself, but because love was present in a passer-by, and because he and his wife pitied and loved me. The orphans remained alive, not because of their mother's care, but because there was love in the heart of a woman a stranger to them, who pitied and loved them. And all men live not by the thought they spend on their own welfare, but because love exists in man.
I knew before that God gave life to men and desires that they should live; now I understood more than that.
I understood that God does not wish men to live apart, and therefore he does not reveal to them what each one needs for himself; but he wishes them to live united, and therefore reveals to each of them what is necessary for all.
I have now understood that though it seems to men that they live by care for themselves, in truth it is love alone by which they live. He who has love, is in God, and God is in him, for God is love.

Speech to the American Legion convention, New York City (27 August 1952); as quoted in "Democratic Candidate Adlai Stevenson Defines the Nature of Patriotism" in Lend Me Your Ears : Great Speeches In History (2004) by William Safire, p. 81 - 82
Context: It was always accounted a virtue in a man to love his country. With us it is now something more than a virtue. It is a necessity. When an American says that he loves his country, he means not only that he loves the New England hills, the prairies glistening in the sun, the wide and rising plains, the great mountains, and the sea. He means that he loves an inner air, an inner light in which freedom lives and in which a man can draw the breath of self-respect.
Men who have offered their lives for their country know that patriotism is not the fear of something; it is the love of something.

Book 4, Chapter 34, Section 7 https://babel.hathitrust.org/cgi/pt?id=njp.32101074938968;view=1up;seq=231.
Often mistranslated as "The glory of God is man fully alive" (see http://www.touchstonemag.com/archives/article.php?id=25-05-003-e).
The context of the passage https://web.archive.org/web/20170126222027/http://earlychurchtexts.com/public/irenaeus_glory_of_god_humanity_alive.htm is: "And for this reason did the Word become the dispenser of the paternal grace for the benefit of men, for whom He made such great dispensations, revealing God indeed to men, but presenting man to God, and preserving at the same time the invisibility of the Father, lest man should at any time become a despiser of God, and that he should always possess something towards which he might advance; but, on the other hand, revealing God to men through many dispensations, lest man, falling away from God altogether, should cease to exist. For the glory of God is a living man; and the life of man consists in beholding God. For if the manifestation of God which is made by means of the creation, affords life to all living in the earth, much more does that revelation of the Father which comes through the Word, give life to those who see God."
Against Heresies

Part i, canto ii.
Lucile (1860)

Of Humanity -->
A short Schem of the true Religion

Source: The Road