Here, before the veil, the ordinary priests had to stop and proceed no further. Because within the veil, in the Most Holy Place, lay the Ark of the Covenant. The Ark represents God's presence and no one, no one except the High Priest, would be allowed to see the Ark. And he only saw it once a year on the Day of Atonement. The veil separated God and man. But when Christ died on the cross, the veil (of Herod's Temple) was torn apart from top to bottom by God, declaring that man can now access into His presence freely through Christ Jesus (Hebrews 10:19-25).