I wouldn’t worry about your concern, committing the unpardonable sin. The fact that you are worried about it shows that you haven’t committed it.
Anyone who commits the unpardonable sin does not have any concerns about it. The Holy Spirit leaves that person and so the person has no feelings at all for spiritual things.
There are two ways in which a person commits the unpardonable sin:
1. is attributing the work of God the Holy Spirit to the work of Satan.
In Matthew 12, the Jewish leaders (Pharisees) accused Jesus of casting out demons by Beelzebub the prince of demons (Satan). Read Verses 22-32. to get the context of what Jesus is saying to them.
2. Paul says in Ephesians 4:30 not to grieve the Holy Spirit.
The only way that we can grieve the Holy Spirit, if we continue to refuse to repent of our sinful life. If we do not come to Christ for the forgiveness of our sins then we cannot be forgiven from our unrighteousness. 1 John 1:9 clearly says:
9 If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness.
So if we refuse to confess our sins then we cannot be for given in this life or the next.
a one off sin does not constitute a sin against the HS — but a continuous rejection of truth.
As far as evil thoughts are concerned, we all have them, and we wonder why we have these thoughts? but it is Satan that is trying to discourage us from seeking out Christ our Saviour.
there is a difference between evil thoughts and thoughts of evil.
Just remember, Christ is a greater Saviour than we are a sinner.
I pray that that will help you.
May God continue to bless you.