Regarding sanctification Hebrews 10:14 says: This verse says how those who are sanctified are perfected forever before God.
The good question to ask is what does it mean to be sanctified? The Hebrew word translated as sanctify is ‘qadash’.
The first usage in the Bible is Genesis 2:3 which reads: This verse tells us God sanctified this day by making it different than the first six days of creation.
So one meaning of sanctification is to be distinct from the surroundings.
In Leviticus 20:7 the nation of Israel was to be told: The saints were to live godly lives by sanctifying themselves to obey God.
There is also a sanctification that is performed by one on the behalf of many.
Exodus 31:13 says: The Greek word translated as sanctify is ‘hagiazō’.
Like it’s Hebrew counterpart, it is also used in the same ways.
2 Timothy 2:21 reads: Here is a sanctification that is the result of a mans work.
Regarding this aspect of sanctification John 17:17 reads: Here Jesus says this aspect of sanctification comes through the scriptures.
Then in Acts 26:18 Jesus says: Here this aspect of sanctification comes by faith in Jesus as the savior.
So what aspect of sanctification is Hebrews 10:14 referring to? The context reveals it in Hebrews 10:10 which reads: These two aspects of sanctification make the saints distinct in the following two ways: First those who receive God’s gift of grace are distinct because they have crossed over from death to life, and have no condemnation.
The have no condemnation because they are in Christ, and being in Christ does not mean being free from sin as 1 Corinthians 3:1 shows.
The second aspect is when you live according to God’s instructions and are distinct because you are walking in the spirit, rather than the flesh.
Both aspects are wonderful, though the second may not be continual as it depends on our obedience.
The first is instantaneous once we come to Christ, and is “forever”.
If you believe you can only be perfected forever by living a holy life, consider Leviticus 19:2 which says: Can you be as holy as God? That means to be perfect, having not once sinned.
The bad news is that only one person has ever pulled that off.
The good news is that you can be holy and righteous before God by simply humbling yourself and accepting his free gift.