Pseudo-Chrysostom: "Solomon says, Before prayer, prepare thy soul. (Ecclus. 18:23.[6]) This he does who comes to prayer doing alms; for good works stir up the faith of the heart, and give the soul confidence in prayer to God. Alms then are a preparation for prayer, and therefore the Lord after speaking of alms proceeds accordingly to instruct us concerning prayer."
Augustine: "He does not now bid us pray, but instructs us how we should pray; as above He did not command us to do alms, but showed the manner of doing them."
Pseudo-Chrysostom: "Prayer is as it were a spiritual tribute which the soul offers of its own bowels. Wherefore the more glorious it is, the more watchfully ought we to guard that it is not made vile by being done to be seen of men."
Chrysostom: "He calls them hypocrites, because feigning that they are praying to God, they are looking round to men; and, He adds, they love to pray in the synagogues."
Pseudo-Chrysostom: "But I suppose that it is not the place that the Lord here refers to, but the motive of him that prays; for it is praiseworthy to pray in the congregation of the faithful, as it is said, In your Churches bless ye God. (Ps. 68:26.[8]) Whoever then so prays as to be seen of men does not look to God but to man, and so far as his purpose is concerned he prays in the synagogue. But he, whose mind in prayer is wholly fixed on God, though he pray in the synagogue, yet seems to pray with himself in secret. In the corners of the streets, namely, that they may seem to be praying retiredly; and thus earn a twofold praise, both that they pray, and that they pray in retirement."
Glossa Ordinaria: "Or, the corners of the streets, are the places where one way crosses another, and makes four cross-ways."
Pseudo-Chrysostom: "He forbids us to pray in an assembly with the intent of being seen of that assembly, as He adds, that they may be seen of men. He that prays therefore should do nothing singular that might attract notice; as crying out, striking his breast, or reaching forth his hands."
Augustine: "Not that the mere being seen of men is an impiety, but the doing this, in order to be seen of men."
Chrysostom: "It is a good thing to be drawn away from the thought of empty glory, but especially in prayer. For our thoughts are apt to stray of themselves; if then we address ourselves to prayer with this disease upon us, how shall we understand those things that are said by us?"
Augustine: "The privity of other men is to be so far shunned by us, as it leads us to do anything with this mind that we look for the fruit of their applause."
Pseudo-Chrysostom: "Verily I say unto you, they have received their reward, for every man where he sows there he reaps, therefore they who pray because of men, not because of God, receive praise of men, not of God."
Chrysostom: "He says, have received, because God was ready to give them that reward which comes from Himself, but they prefer rather that which comes from men. He then goes on to teach how we should pray."
Jerome: "This if taken in its plain sense teaches the hearer to shun all desire of vain honour in praying."
Pseudo-Chrysostom: "That none should be there present save he only who is praying, for a witness impedes rather than forwards prayer."