“Replicators are no longer peppered freely through the sea; they are packaged in huge colonies—individual bodies. And phenotypic consequences, instead of being evenly distributed throughout the world, have in many cases congealed into those same bodies. But the individual body, so familiar to us on our planet, did not have to exist. The only kind of entity that has to exist in order for life to arise, anywhere in the universe, is the immortal replicator.”

Source: The Shape of Time, 1982, p. 130

Source: LifeParticle Meditation: A Practical Guide to Healing and Transformation

Source: Path of Life (1909), p. 12

Source: Sun and Steel (1968), p. 87.
Context: Only through the group, I realised — through sharing the suffering of the group — could the body reach that height of existence that the individual alone could never attain. And for the body to reach that level at which the divine might be glimpsed, a dissolution of individuality was necessary. The tragic quality of the group was also necessary, the quality that constantly raised the group out of the abandon and torpor into which it was prone to lapse, leading it to an ever-mounting shared suffering and so to death, which was the ultimate suffering. The group must be open to death — which meant, of course, that it must be a community of warriors.

The Prodromus of Nicolaus Steno's Dissertation Concerning a Solid https://www.biodiversitylibrary.org/bibliography/54340#/summary : (Page 217)

Source: Vedartha Sangraham, 11th century, p. 9-10.

Against Celsus, Bk. 6, ch. 79; vol. 2, p. 422.
Against Celsus
Context: There was no need that there should everywhere exist many bodies, and many spirits like Jesus, in order that the whole world of men might be enlightened by the Word of God. For the one Word was enough, having arisen as the "Sun of righteousness (Malachi chpt. 3)," to send forth from Judea His coming rays into the soul of all who were willing to receive Him. But if any one desires to see many bodies filled with a divine Spirit, similar to the one Christ, ministering to the salvation of men everywhere, let him take note of those who teach the gospel of Jesus in all lands in soundness of doctrine and uprightness of life, and who are themselves termed "christs" by the Holy Scriptures, in the passage, "Touch not mine anointed, and do not my prophets any harm." For as we have heard that Antichrist cometh, and yet have learned that there are many antichrists in the world, in the same way, knowing that Christ has come, we see that, owing to Him, there are many christs in the world, who, like Him, have loved righteousness and hated iniquity, and therefore God, the God of Christ, anointed them also with the "oil of gladness." But inasmuch as He loved righteousness and hated iniquity above those who were His partners, He also obtained the first-fruits of His anointing, and, if we must so term it, the entire unction of the oil of gladness; while they who were His partners shared also in His unction, in proportion to their individual capacity.

Interview http://americanindian.net/asimov.html in Southwest Airlines Magazine 1979)
General sources

Cosmic Life (1916)