1 Thessalonians 5:16

So, too, "Eye for eye, and tooth for tooth," has now grown old, ever since "Let none render evil for evil" grew young.

For no one is going to turn away from sin and start behaving righteously unless he thinks about what he is doing. Not until he has been straightened out by practicing godly behavior will he actually possess the reward of faith: the crown of righteousness that Paul possessed, having fought the good fight. That crown is laid up not just for Paul but for all who are like him in this respect. This sort of meditation and exercise in godliness should be familiar to us, as it was to the saints of old. It should be especially so in the season when the divine word calls upon us to keep the feast. For what, after all, is the feast but continual worship of God, recognition of godliness and unceasing prayer all done from the heart in full agreement with each other? St. Paul, wanting us to be so inclined, urges us, "Always rejoice, pray without ceasing, give thanks in all things."

For such meditation and exercise in godliness, being at all times the habit of the saints, is urgent on us at the present time, when the divine word desires us to keep the feast with them if we are in this disposition. For what else is the feast, but the constant worship of God, and the recognition of godliness, and unceasing prayers from the whole heart with agreement? So Paul wishing us to be ever in this disposition, commands, saying, 'Rejoice evermore; pray without ceasing; in everything give thanks.' Not therefore separately, but unitedly and collectively, let us all keep the feast together, as the prophet exhorts, saying, 'O come, let us rejoice in the Lord; let us make a joyful noise unto God our Saviour.' Who then is so negligent, or who so disobedient to the divine voice, as not to leave everything, and run to the general and common assembly of the feast? which is not in one place only, for not one place alone keeps the feast; but 'into all the earth their song has gone forth, and to the ends of the world their words.' And the sacrifice is not offered in one place, but 'in every nation, incense and a pure sacrifice is offered unto God.' So when in like manner from all in every place, praise and prayer shall ascend to the gracious and good Father, when the whole Catholic Church which is in every place, with gladness and rejoicing, celebrates together the same worship to God, when all men in common send up a song of praise and say, Amen; how blessed will it not be, my brethren! who will not, at that time, be engaged, praying rightly?

Fo paye and psalmody, howeve, as also, indeed, fo some othe duties, evey hou is suitable, that, while ou hands ae busy at thei tasks, we may paise God sometimes with the tongue (when this is possible, o, athe, when it is conducive to edification); o, if not, with the heat…. Thus we acquie a ecollected spiit—when in evey action we beg fom God the success of ou labos and satisfy ou debt of gatitude to him who gave us the powe to do the wok, and when, as has been said, we keep befoe ou minds the aim of pleasing him. If this is not the case, how can thee be consistency in the wods of the apostle bidding us to "pay without ceasing," with those othe wods, "we woked night and day." The Long Rules q..

Then, because he [David] had been delivered from great danger, he sent up this prayer of thanksgiving to God who had rescued him. "I will bless the Lord at all times." Having escaped death, as if he were setting up norms for his life, he molded his soul to an exact manner of living, so that he ceased at no time from praise but referred the beginning of affairs, great and small, to God. "I will not think," he says, "that anything was done through my diligence nor happened through spontaneous chance, but, 'I will bless the Lord at all times,' not only in prosperity of life, but also in precarious times." The apostle, learning from this, says, "Rejoice always. Pray without ceasing. In all things give thanks."

"Rejoice alway."

This is said with respect to the temptations that bring in affliction. Hear ye, as many as have fallen into poverty, or into distressing circumstances. For from these joy is engendered. For when we possess such a soul that we take revenge on no one, but do good to all, whence, tell me, will the sting of grief be able to enter into us? For he who so rejoices in suffering evil, as to requite even with benefits him that has done him evil, whence can he afterwards suffer grief? And how, you say, is this possible? It is possible, if we will. Then also he shows the way.

Those who, together with labours, possess innocency of soul also, become the discoverers of the kingdom which is in them, and in its blessings they fare luxuriously and revel in continual joy, over which sorrow ruleth not, because at all times they rejoice in the gladness which is born of them, even as Paul also said, "Rejoice at all times," and in another place he also said, "Rejoice in your hope, and endure patiently your tribulations; for from the patient endurance of tribulations the hope concerning the things which are to come increaseth in us."

"Sing with jubilation to God, all the earth." The prophet was troubled for the faithful people in case they believe they are to serve the Lord with gloomy anxiety, so he began at once with jubilation, for ministering to the Lord with happiness of mind constitutes the perfect devotion of the just man. As Paul warns us, "Always rejoice: pray without ceasing: in all things give thanks."

Even if you have fallen into temptation. Look: after he said that one must not repay evil for evil, he further commands to rejoice. If a person is trained such that he never avenges himself against anyone, but on the contrary, even does good to the person who caused him grief, then from where can the sting of sorrow penetrate him?

Then when Paul says: rejoice always, he shows how they ought to behave towards God; and he mentions three things. First, to rejoice in Him; and so Paul says, rejoice always, that is, in God; for whatever evil might occur, it is incomparable to the goodness which is God. Hence, no evil ought to interrupt it, and so Paul insists: rejoice always.