These opinions, Florinus, that I may speak in mild terms, are not of sound doctrine; these opinions are not consonant to the Church, and involve their votaries in the utmost impiety; these opinions, even the heretics beyond the Church's pale have never ventured to broach; these opinions, those presbyters who preceded us, and who were conversant with the apostles, did not hand down to you. For, while I was yet a boy, I saw you in Lower Asia with Polycarp, distinguishing yourself in the royal court, and endeavouring to gain his approbation.
For I have a more vivid recollection of what occurred at that time than of recent events (inasmuch as the experiences of childhood, keeping pace with the growth of the soul, become incorporated with it); so that I can even describe the place where the blessed Polycarp used to sit and discourse— his going out, too, and his coming in— his general mode of life and personal appearance, together with the discourses which he delivered to the people; also how he would speak of his familiar intercourse with John, and with the rest of those who had seen the Lord; and how he would call their words to remembrance.
Whatsoever things he had heard from them respecting the Lord, both with regard to His miracles and His teaching, Polycarp having thus received [information] from the eye-witnesses of the Word of life, would recount them all in harmony with the Scriptures. These things, through, God's mercy which was upon me, I then listened to attentively, and treasured them up not on paper, but in my heart; and I am continually, by God's grace, revolving these things accurately in my mind. And I can bear witness before God, that if that blessed and presbyter had heard any such thing, he would have cried out, and stopped his ears, exclaiming as he was wont to do: “O good God, for what times have You reserved me, that I should endure these things?”
And he would have fled from the very spot where, sitting or standing, he had heard such words. This fact, too, can be made clear, from his Epistles which he dispatched, whether to the neighbouring Churches to confirm them, or to certain of the brethren, admonishing and exhorting them.
Source: Fragments from the Lost Writings of Irenaeus (New Advent)