It is central to the message of Hebrews that Christ's work of deliverance is complete. Christ is the perfect Saviour because he saves perfectly. There is nothing partial, conditional, or temporary about the salvation that is in Christ. Nothing is left to chance. Nothing is left to man's fallible 'decision' or 'commitment'. Jesus' work of atonement is a finished work of grace that has completely and eternally saved his elect. Their entrance into 'glory' is assured.
If you like the sound of that and want to join the club, please let me know (ladies only).