In just a few verses after this text our writer will pen these bright words of hope - Hebrews 10:19-22 - "Therefore, brothers, since we have confidence to enter the holy places by the blood of Jesus, by the new and living way that he opened for us through the curtain, that is, through his flesh,  and since we have a great priest over the house of God,  let us draw near with a true heart in full assurance of faith,with our hearts sprinkled clean from an evil conscience and our bodies washed with pure water."
That, for sure, is a much prettier text than the one we're working through today. But they're related. And they're related as cause and effect - root and fruit. It's the less pretty verses in our chapter nine text that create the possibility of the assurance manifested in that chapter ten text.
Or let me say it like this. Without working through the logic of our chapter nine text you will have to find some hit and miss way to work up feeling the assurance of our chapter ten text. And the problem with that is our writer doesn't present that assurance in chapter ten as a psychological assurance. He develops it as a doctrinal assurance - a confidence and assurance built on the truth of Biblical revelation. You can't for very long just work this assurance up in your emotions. You dig this confidence out of the Biblical text.