Since therefore the children share in flesh and blood, he himself likewise partook of the same things, that through death he might destroy the one who as the power of death, that is, the devil, and deliver all those who through fear of death were subject to lifelong slavery- Hebrews 2:14-15 (ESV).
The death of Christ for us was the defeat of the devil; but it is not the end of the story, for it was followed by his resurrection, ascension, and crowning with glory and honor. This is the great vindication of Christ’s saving work, the assurance of its perfection and its acceptance by God, as well as its eternal efficacy for man. It must be plain to all that if Good Friday had not been followed by Easter, that is, if Christ were still dead and buried, then he would be no savior, for Satan, not he, would have been the victor and the power of death would have remained in full force. But the victory is Christ’s and, as the next verse declares, he is indeed our all-powerful deliverer. “By the sacrifice of his body he did two things,” says Athanasius with reference to this verse: “he put an end to the law of death which barred our way, and he made a new beginning of life for us by giving us the hope of resurrection.” And as the says elsewhere, Christ’s victory “vouchsafed a blessing instead of a curse, joy instead of grief, a feast instead of mourning, in this holy joy of Easter.”
Philip Edgcumbe Hughes, A Commentary on the Epistle to the Hebrews, page 113