Didymus the Blind : There is an absolute righteousness and a righteousness that is only righteous for one.… A righteous person can get lost in what is only righteous for him. Those, however, who are really righteous … do not remain in what is righteous for them alone and do not trust in this as their own right. This is why he does not perish in absolute righteousness, as the psalmist says: "In your righteousness I will live." Paul, for example, who was a great man who lived in Christ and for whom truth was revealed, said, "I am not aware of anything against myself, but I am not thereby acquitted." — COMMENTARY ON Ecclesiastes 213:23 Jerome : "In the day of prosperity be joyful, but in the day of adversity consider: God also has set the one over against the other, to the end that man should find nothing after him. "I have heard from a certain man in the Church, who was thought to have a knowledge of the Scriptures, that these verses are to be explained in this way: while you remain in the present world, and while you are able to do good work, work hard so that afterwards you may be without worry in the day of wickedness, that is the day of judgement, when you will see others to be tormented. For just as God made the present world, in which we can obtain for ourselves the benefits of good work; so too he made the future age, in which no opportunity will be given for us to do good work. This man of the Church even seemed to convince those he was preaching to, but to me there seems a different meaning to this, which Symmachus has translated, saying, 'in the good day, be good; but be wary of the day of wickedness'. All the same, God made this world similar to the next, so that man should not be able to find that which he complains against Him. Suffer both the good things, he says, and the bad, as they happen to you in your life. And do not think that there is only the nature of good or bad alone in the world, especially when the world itself consists of opposites: hot and cold, dry and wet, hard and soft, dark and light, bad and good. [Cfr Ovid, Meta. I.19-20.] But God made this ambivalence so that wisdom might have a place, and it is found by choosing good and avoiding bad: man is given free will, lest he argue that he has been made unfeeling, and stupid by God. But God has made man so diverse that man is unable to complain of his manner of being. At the same time this argument is to be taken with the previous verses, in which he says 'who is able to correct what God has done?'. — Commentary on Ecclesiastes