“Live with the gods.”

The Tragic Sense of Life (1913), X : Religion, the Mythology of the Beyond and the Apocatastasis
Context: Jesus said that God was not the God of the dead, but of the living. And the other life is not, in fact, thinkable to us except under the same forms as those of this earthly and transitory life.

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

551-553
Fruits of Solitude (1682), Part I
Context: Did we believe a final Reckoning and Judgment; or did we think enough of what we do believe, we would allow more Love in Religion than we do; since 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. It is most reasonable Men should value that Benefit, which is most durable. Now Tongues shall cease, and Prophecy fail, and Faith shall be consummated in Sight, and Hope in Enjoyment; but Love remains.

"A Tale of Two Pieties", in The Chair of Babel (Oxford: Oxford University Press, 1992) p. 51.

Notebooks

Book I, Chapter 6, p. 143 ( See also: Rene Girard, and James George Frazer)
The Origin of Consciousness in the Breakdown of the Bicameral Mind (1976)

No. 76 http://books.google.com/books?id=eypXAAAAYAAJ&q=%22When+God's+hand+is+bent+to+strike+it+is+a+fearful+thing+to+fall+into+the+hands+of+the+living+God+but+to+fall+out+of+the+hands+of+the+living+God+is+a+horror+beyond+our+expression+beyond+our+imagination%22&pg=PA386#v=onepage, preached at Sion to The Earl of Carlisle and company (c. 1622)
LXXX Sermons (1640)

No printed sources exist for this prior to 2009, and this seems to have been an attribution which arose on the internet, as indicated by web searches and rationales provided at "Marcus Aurelius and source checking" at Three Shouts on a Hilltop (14 June 2011) http://threeshoutsonahilltop.blogspot.com/2011/06/marcus-aurelius-and-source-checking.html
This quote may be a paraphrase of Meditations, Book II:
Since it is possible that thou mayest depart from life this very moment, regulate every act and thought accordingly.
But to go away from among men, if there are gods, is not a thing to be afraid of, for the gods will not involve thee in evil;
but if indeed they do not exist, or if they have no concern about human affairs, what is it to me to live in a universe devoid of gods or devoid of Providence?
But Gods there are, undoubtedly, and they regard human affairs; and have put it wholly in our power, that we should not fall into what is truly evil
Misattributed