A.T. Robertson Commentary Hebrews 6:19

"which we have as an anchor of the soul, [a hope] both sure and stedfast and entering into that which is within the veil;" — Hebrews 6:19 (ASV)

Which (ην). Which hope. What would life be without this blessed hope based on Christ as our Redeemer?

As an anchor of the soul (ως αγκυραν της ψυχης). Old word, literally in Ac 27:29, figuratively here, only N.T. examples. The ancient anchors were much like the modern ones with iron hooks to grapple the rocks and so hold on to prevent shipwreck (1 Timothy 1:19).

Both sure and steadfast (ασφαλη τε κα βεβαιαν). This anchor of hope will not slip (alpha privative and σφαλλω, to totter) or lose its grip (βεβαια, from βαινω, to go, firm, trusty).

That which is within the veil (το εσωτερον του καταπετασματος). The Holy of Holies, "the inner part of the veil" (the space behind the veil), in N.T. only here and Ac 16:24 (of the inner prison). The anchor is out of sight, but it holds. That is what matters.