Bede : But Noah lived three hundred and fifty years after the flood, and all the days of his life were nine hundred and fifty years, and he died. As we have taught above, the six hundred years of Noah's life, after which he entered the ark, signify the perfection of the faith and profession of those who undergo the sacraments of the Church of heavenly grace and everlasting reward. Thus also the three hundred and fifty years which he lived after the flood represent the great perfection of those who, having received the sacraments of life, faithfully serve the Lord until death. We said that the number three hundred, because it is marked by the letter tau in Greek (and tau is written in the figure of a cross), most aptly bears the type of those who know to glory only in the cross of our Lord Jesus Christ; whence Gideon, with the Lord commanding and helping, defeated the innumerable army of the Midianites with three hundred men, teaching figuratively that by the faith of the Lord's cross we would be victorious over the wars against us by this world and our vices. Moreover, the number fifty, because Scripture teaches that it designates the rest of the law by figure, which always in the fiftieth year decreed the greatest remission of all sufferings and the liberation from all services for God's entire people. Therefore, Noah lived three hundred and fifty years after the flood with a certain grace of mystery, to signify that we, having received the baptismal washing, should endure labors for the Lord in hope of the supreme rest and happiness. For he lived three hundred years to be patient in tribulation; he lived fifty years to be joyful in hope. But since seven times fifty make three hundred and fifty, and the number seven signifies the grace of the Holy Spirit, and fifty signifies true rest, which is given to the elect through the same Spirit, the type aptly corresponds. We can also interpret in this way the mystery of this number, that he who lives three hundred and fifty years after the flood, symbolizes the one who, throughout the whole time of received baptism, aided by the spiritual gift, does not cease to labor for eternal rest in heaven; and he will happily see the death of the flesh, or rather, he will pass from death to life, which alone is to be called true life, who completes the course of present life in such a great perfection. Amen. — Commentary on Genesis (Hexaemeron)