From a homily by Saint Basil the Great, bishop
(Hom. 20 De humiliate, 3: PG 31, 530-531)
Boast only of the Lord
The wise man must not boast of his wisdom, nor the strong man of his strength, nor the rich man of his riches. What then is the right kind of boasting? What is the source of man’s greatness? Scripture says:
The man who boasts must boast of this, that He knows and understands that I am the Lord. Here is man’s greatness, here is man’s glory and majesty: to know in truth what is great, to hold fast to it, and to seek glory from the Lord of glory. The Apostle tells us:
The man who boasts must boast of the Lord. He has just said:
Christ was appointed by God to be our wisdom, our righteousness, our sanctification, our redemption, so that, as it is written, a man who boasts must boast of the Lord.
Boasting of God is perfect and complete when we take no pride in our own righteousness but acknowledge that we are utterly lacking in true righteousness
and have been made righteous only by faith in Christ.
Monday, Week 3 - Office of Readings
Chrysostom does use 'alone' not once but twice in his homily on Acts chapter 15:
Do you mark how closely the trials succeed each other, from within, from without? It is well ordered too, that this happens when Paul is present, that he may answer them. When therefore Paul and Barnabas had no small dissension and disputation with them, they determined that Paul and Barnabas, and certain other of them, should go up to Jerusalem unto the apostlesand elders about this question. Acts 15:2 And Pauldoes not say, What? Have I not a right to be believedafter so many signs? But he complied for their sakes. And being brought on their way by the Church, they passed through Phenice and Samaria, declaring the conversion of the Gentiles: and they caused great joyunto all the brethren. Acts 15:3 And observe, the consequence is that all the Samaritans also, learn what has come to the Gentiles: and they rejoiced. And when they had come to Jerusalem, they were received of the Church, and of the apostles and elders, and they declared all things that God had done with them. Acts 15:4 See what a providence is here! But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses. And the apostles and elders came together to consider of this matter.
And when there had been much disputing, Peter rose up and said unto them, Men and brethren, you knowhow that of old days God made choice among us, that the Gentiles by my mouth should hear the word of the Gospel, and believe. Acts 15:5-7 Observe Peter from the first standing aloof (κεχωρισμένον) from the affair, and even to this time judaizing. And yet (says he) ye know. ch. 10:45; 11:2 Perhaps those were present who of old found fault with him in the matter of Cornelius, and went in with him (on that occasion): for this reason he brings them forward as witnesses. From old days, he says, did choose among you. What means, Among you? Either, in Palestine, or, you being present. By my mouth. Observe how he shows that it was God speaking by him, and no human utterance. And God, that knows the hearts, gave testimony unto them: he refers them to the spiritual testimony: by giving them the Holy Ghost even as unto us. Acts 15:8 Everywhere he puts the Gentiles upon a thorough equality. And put no difference between us and them, having purified their hearts by faith. Acts 15:9 From faith alone, he says, they obtained the same gifts. This is also meant as a lesson to those (objectors); this is able to teach even them that faith only is needed, not works nor circumcision. For indeed they do not say all this only by way of apology for the Gentiles, but to teach (the Jewish believers) also to abandon the Law.
(NPNF1-11. Saint Chrysostom: Homilies on the Acts of the Apostles and the Epistle to the Romans - Christian Classics Ethereal Library) (Saint Chrysostom: Homilies on the Acts of the Apostles and the Epistle to the Romans)