10:19 boldness to enter. Because of what Christ has done for us, we can come boldly (certainly not arrogantly or presumptuously, however) into God’s presence in prayer (Hebrews 4:16; Ephesians 3:12). We can also have confidence (same Greek word as “boldness”) in witnessing for Christ (Acts 4:29, 31).
10:19 into the holiest. In the ancient tabernacle only the High Priest was allowed to enter the “holy of holies” to commune with God, and that only once a year. Now the veil has been rent (as the body of His flesh bore our sins and died—I Peter 2:24), and all who come through Christ can come to the very throne of grace (Hebrews 4:16).