“Earlier he had spoken of “not neglecting to meet together” [Hebrews 10:25], and here he hints at it again [Hebrews 12:14]. For nothing so especially makes persons easily vanquished and subdued in temptations as isolation. For scatter a phalanx in war, and the enemy will have no trouble but will take them prisoners, coming on them separately and thus the more helpless.” On the EPISTLE TO THE HEBREWS 30.2
John Chrysostom (344/354-407; fl 386-407). Bishop of Constantinople
Oden, Thomas, General Editor Ancient Christian Commentary on Scripture: New Testament X: Hebrews 219