And why do you skip over this part of 1 John 2 that you quoted? See the underlined. I have included the words you put in brackets, and will come to that in a minute. But first, what does it say? It says, if any man sins - that includes regenerate men or women - then he or she has an Advocate with the Father, Jesus Christ the Righteous. And why? Because Jesus Christ is the Propitiation for our sins, the sins of Christians, just like He offered His Life also for the sins of the whole world.
[1 John 2:1-2 KJV] My little children, these things write I unto you, that ye sin not. And if any man sin ((the world)), we have an advocate with the Father, Jesus Christ the righteous: 2 And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.
As for Hebrews 10:26, yes, it means believers should not deliberately/willfully go on sinning. We may sin out of weakness, and those sins will be forgiven when we confess them. Think of King David, he had the Holy Spirit from his youth. Yet he committed adultery with Uriah's wife. The Lord forgave him when he confessed the sin, but also disciplined him in that.
[1 John 2:1-2 KJV] My little children, these things write I unto you, that ye sin not. And if any man sin ((the world)), we have an advocate with the Father, Jesus Christ the righteous: 2 And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.
As for Hebrews 10:26, yes, it means believers should not deliberately/willfully go on sinning. We may sin out of weakness, and those sins will be forgiven when we confess them. Think of King David, he had the Holy Spirit from his youth. Yet he committed adultery with Uriah's wife. The Lord forgave him when he confessed the sin, but also disciplined him in that.