The "things" are "good in themselves", "holy", or "heavenly", and in "heaven itself", where Christ has entered as our High Priest to "minister" for us; and those "holy things" "in heaven" are connected with the "greater and more perfect tabernacle", "which the Lord pitched and not man"; the same as the holy things of first covenant were connected with their tabernacle, Hebrews 9:1-5; and all those holy things together make the Sanctuary. The Holies (two) verse 8, the way of which was not made manifest till the time of reformation, when Christ shed His own blood, belong to His "greater and more perfect tabernacle", spoken of in the next verse. I translate the names literal, because they are not literal in our common version.
The Douay Bible has them as here given. The word in Hebrews 9:8,10,19, is Hagion, "of the Holies", instead of the "holiest of all"; and shows that the blood of Christ is the way or means by which He, as our High Priest was to enter both apartments of the heavenly tabernacle. Now if there be but one place in the heavens, as many say, why were there two in figure?
And why, in applying figure, does Paul speak of two? Perhaps those who "despise the law" and "corrupt the covenant of Levi" can explain this; if not, we advise them to abide by Paul's exposition of the matter. Hebrews 6:19,20, is supposed to prove that Christ entered the Holy of Holies at His ascension, because Paul said He had entered within the veil.
But the veil which divides between the Holy and the Holy of Holies is "the second veil", Hebrews 9:3; hence there are two veils, and that in Hebrews 6, being that of which he speaks, must be that veil, which hung before the Holy, and in Exodus was called a curtain. When He entered within the veil, He entered His tabernacle, of course the Holy, as that was that apartment; and our hope, as an anchor of the soul, enters within the veil, i.e., the atonement of both apartments, including both the forgiveness and the blotting out of sins.