From Justin Martyr’s First Apology, addressed to the Roman emperor Antoninus Pius. Justin was martyred c. 165 A.D. From Ante-Nicene Fathers, volume 1, pp. 166-167.
What sober-minded man, then, will not acknowledge that we are not atheists, worshipping as we do the Maker of this universe, and declaring, as we have been taught, that He has no need of streams of blood and libations and incense; whom we praise to the utmost of our power by the exercise of prayer and thanksgiving for all things wherewith we are supplied, as we have been taught that the only honor that is worthy of Him is not to consume by fire what He has brought into being for our sustenance, but to use it for ourselves and those who need, and with gratitude to Him to offer thanks by invocations and hymns for our creation, and for all the means of health, and for the various qualities of the different kinds of things, and for the changes of the seasons; and to present before Him petitions for our existing again in incorruption through faith in Him…
And thus do we also, since our persuasion by the Word, stand aloof from them [the demons], and follow the only unbegotten God through His Son—we who formerly delighted in fornication, but now embrace chastity alone; we who formerly used magical arts, dedicate ourselves to the good and unbegotten God; we who valued above all things the acquisition of wealth and possessions, now bring what we have into a common stock, and communicate to every one in need; we who hated and destroyed one another, and on account of their different manners would not live with men of a different tribe, now, since the coming of Christ, live familiarly with them, and pray for our enemies, and endeavor to persuade those who hate us unjustly to live conformably to the good precepts of Christ, to the end that they may become partakers with us of the same joyful hope of a reward from God the ruler of all.