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).

10:25 assembling of ourselves together. This verse is often cited as an incentive to regular church attendance, but it also relates to any gathering of two or more believers in His name (Matthew 18:20).

10:25 the day approaching. The approaching day is the day when Christ returns. Note Hebrews 9:28 and 10:37.