“The exhortation pertains more to doing good works and showing love as the addressees look around at their fellow believers, observing their situations and persons attentively. The author may, moreover, seek to establish an emulative environment: “paying attention to one another” will not only lead to seeing and responding to need, but also will involve seeing one’s sisters’ and brothers’ noble deeds and becoming zealous to emulate them, such that doing good stimulates more well-doing. The author approaches the congregation first by urging them to look at each other, to see each other, to notice one another. He does not merely exhort them to preach well-doing, but to be engaged in it first, and then perchance to stimulate it and be stimulated to well-doing by mutual example. This connects with the author’s exhortations throughout Hebrews (3:12-14; 12:15-17; 13:1-3, 16) to create the sort of intragroup relationships and support structures that make it possible, even preferable, to put up with the snubbing hostility from without rather than give up on the love and mutual regard that exist within. ”

— David DeSilva, Perseverance in Gratitude: A Socio-Rhetorical Commentary on the Epistle “to the Hebrews” (Grand Rapids, MI: Eerdmans, 2000), 341-42.