The author is concerned about those who may disregard salvation. He first makes it clear that it isn't because there wasn't enough evidence. "It was confirmed to us by those who heard" (Heb 2:3). Luke cites that "they were handed down to us by those who from the beginning were eyewitnesses and servants of the word" (Lk 1:2). It was "Jesus, because of the suffering of death . . . that by the grace of God He might taste death for everyone" (Heb 2:9) whereby "bringing many sons to glory, to perfect the author of their salvation through sufferings" (:10). This is not just a generalization for posterity's sake in accordance with "'Has it not been written in your Law, 'I said, you are gods'?'" (Jn 10:34). "You have appointed him over the works of Your hands; you have put all things in subjection under His feet" (Heb 2:6). It is in accordance with the brethren because "beloved, we are convinced of better things concerning you, and things that accompany salvation" (6:9). For this "reason He is not ashamed to call them brethren" (2:11). "'I will proclaim Your name to My brethren, in the midst of the congregation I will sing Your praise'" (:12).
At first glance Hebrews 2:1-4 could be looked at as a brief mention of importance. Verse one is apostasy, two the Law, three the gospel and four miracles. The Hebrews being addressed would remember when reminded. One would think a subject of such importance would require more emphasis. Peter's sermon reiterates Jesus' "miracles and wonders and signs which God performed through Him in your midst, just as you yourselves know" (Ac 2:22). "Everyone kept feeling a sense of awe; and many wonders and signs were taking place through the apostles" (:43). Hebrews then repeats that it was "God also testifying with them, both by signs and wonders and by gifts of the Holy Spirit according to His own will" (Heb 2:4). Paul thought it important to ask the Galatians "does He who provides you with the Spirit and works miracles among you, do it . . . by faith?" (Gal 3:5). Revelation came "to you through those who preached the gospel to you by the Holy Spirit sent from heaven" (1Pe 1:12). But even today cessationists believe that miracles ceased when the apostles died. The author of Hebrews is reminding them of the applicability of the ministry of the Holy Spirit. Jesus highlighted the tendency of "'unless you people see signs and wonders, you simply will not believe" (Jn 4:48). Also, "'You seek Me, not because you saw signs, but because you ate of the loaves and were filled'" (6:26). The Hebrews should have been challenged by this message.