Augustine of Hippo : Speaking of Noah, our unerring Scriptures tell us that he "was a just and perfect man in his generation," meaning that he was perfect as far as citizens of the city of God can be perfect during the pilgrimage of this present life, not, of course, as perfect as they are to be in that immortal life in which they will be as perfect as the angels of God. — City of God 15.26 Bede : These are the generations of Noah. Noah was a just and perfect man in his generations; he walked with God. Noah is praised with the same commendation as Enoch, namely that he followed the footsteps of the divine command with upright steps of good works, and thus, while the world perished, he was saved in the ark. Noah was just and perfect, not as the saints are to be perfected in that immortality in which they will be equal to the angels of God, but as perfect as one can be in this pilgrimage; and therefore it is added, in his generations, to signify that he was just according to the righteousness of his generations, namely, those generations in which Seth, Enos, Enoch, and the other holy and perfect men of that time lived. To these generations, the following text of Holy Scripture indicates, also belonged his sons Shem and Japheth. — Commentary on Genesis (Hexaemeron) Clement of Rome : Let us steadfastly contemplate those who have perfectly ministered to his excellent glory... Noah, being found faithful, preached regeneration to the world through his ministry; and the Lord saved by him the animals which, with one accord, entered into the ark. — Clement's First Letter to the Corinthians, Chapter 9 Clement of Rome : Noah was found faithful by reason of his service; he proclaimed a new birth to the world, and through him the Lord saved the living creatures who entered in harmony into the ark. — THE LETTER TO THE CORINTHIANS 9.2-4 Eusebius of Caesarea : Again after these a third appeared: Noah who has received testimony as 'a righteous man in his generation.' And the following will be proofs of his righteousness. A great foulness and darkness of indescribable wickedness had overtaken the whole human race, and the giants talked of by every mouth were carrying on with ungodly and impious efforts their wars with God which are still so celebrated: and already the fathers of this their brood, whether they had sprung from some condition mightier than man's nature, or in whatever way endowed, are said to have begun the teaching of curious arts among men, and to have introduced devices of witchcraft and other mischievous sorcery into their life, so that the whole human race had fallen under one sentence of judgement with God. — Preparation for the Gospel, BOOK VII, CHAPTER VIII Jerome : (Verse 9) Noah was a righteous and blameless man in his generation, pleasing to God. Specifically, it says 'in his generation' to show that his righteousness was not according to the perfected righteousness, but according to the righteousness of his generation. And this is what is said in Hebrew: Noah was a righteous man, blameless in his generations, he walked with God; that is, he followed in his footsteps. — Hebrew Questions on Genesis