John Chrysostom

"When thou prayest," saith Christ, "thou shalt not be as the hypocrites are; for they love to pray standing in the synagogues and in the corners of the streets, that they may be seen of men. Verily I say unto you, they have their reward. But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father, which is in secret; and thy Father, which seeth in secret, shall reward thee openly." What then says Paul? …

Homily on 1 Timothy 8 ↗

Theophylact of Ohrid

But how does Christ forbid praying in every place? Does He advise against doing this in public squares, and command entering a room for prayer (Matt. 6:6)? No, Christ does not forbid praying in every place, but teaches not to do so out of vainglory, for show. He mentioned only the room, just as in the saying "let not your left hand know what your right hand does" (Matt. 6:3), He speaks not of hands, but points to the exceeding importance of giving alms without vainglory. …

Commentary on 1 Timothy ↗

Oecumenius

Therefore I want the men to pray everywhere, lifting up holy hands without anger or disputing. How then did Christ forbid praying openly? "For He says, 'Go into your room.'" (Matt. 6:6) Christ did not forbid praying in every place, but He said this to turn away from praying for show; just as in "Let not your left hand know what your right hand is doing," (Matt. 6:3) He does not speak about hands, but about doing good deeds without empty glory and not for display. …

Commentary On 1 Timothy ↗

Thomas Aquinas

Then when he says, I will, therefore, he comes down to the specific types of men. In regard to this he does two things: first, he instructs the men about prayer; second, the women, at in like manner, women also. He says, I will, therefore, that men pray. And he requires three things of men in prayer: that it be assiduous, pure and quiet. Assiduous, because it should take place at all times and in every place. …

Commentary on 1 Timothy ↗