Hebrews affirms that by Christ's passion those who share in him have been changed from within (10:22), radically and permanently. This means that the Christian life does not consist in acquiring a holiness we do not have, but rather in appropriating and more deeply living the holiness we have already been given (10:10). So we are invited to a relationship with God that is filled with confident hope and free from the burden of guilt and sin. Our whole life is qualified to be a priestly life, in which all our actions and sufferings are offered as "a sacrifice of praise" that is pleasing to God (13:15-16).
Mary Healy, Hebrews (Catholic Commentary on Sacred Scripture)