The Old Covenant under Moses had a tabernacle that God instructed to be built. However, access was limited the further one got into the tabernacle. The tabernacle was a shadow or patterned after heaven. The priests were even limited in their access. However, Jesus Christ, the priest of the New Covenant has eternal access in the true tabernacle of Heaven. He has allowed access for anyone under the New Covenant of His blood. This access come with a change of heart due to the sacrifice of Christ, something the Old Covenant could never do.