10 By this will we have been sanctified through the offering of the body of Jesus Christ once for all.
Hebrews 10:10 (NASB95)
14 For by one offering He has perfected for all time those who are sanctified.
Hebrews 10:14 (NASB95)
(My thanks to Dr. Andrew Farley for his teaching on this subject)
Sanctify means “to make holy” or “to set apart for God’s use.” Those who have a relationship with Jesus are made holy by Jesus, or set apart for his use, and it is in the past tense so it is already done. Why then do we still sin? Though we are holy, our mind needs to be renewed; we need to replace false thinking patterns with true thinking patterns. This is accomplished by knowing God’s will (the Bible) and doing it. The more we obey, the more our mind is transformed to be like Jesus’ mind. And the less we sin.
Perfected for all time means Jesus’ gift of forgiveness was permanent, we are always forgiven. Though permanent forgiveness opens the possibility of license, or unrestrained sin, God is able to know and do what is best:
4 Or do you think lightly of the riches of His kindness and tolerance and patience, not knowing that the kindness of God leads you to repentance?
Romans 2:4 (NASB95)
One of the things I love about Jesus is he saves me from myself.
If you ever get weary of trying to “stay saved” or are tired of being anxious worrying about whether you may “lose your salvation” ask Jesus what the above verses mean.