Here is a wonderful test of the effectiveness of religion, of the ability of an offering to really take away sins: is the conscience of the worshipper relieved by that offering? If there is a sacrifice which is truly recognised by God, then it will also be applied to the consciences of the worshippers, and it will result in a subjective awareness that they have been forgiven. Though we are on earth and God is in heaven, he is able to give assurance that we are no longer under the guilt of our sins.
The danger was that this repetition built into the law, which by necessity was not reflected in the sacrifice of Christ, might be misunderstood. Perhaps many never thought about the fact that the high priest kept doing the same thing each year. Perhaps it never occurred to them that because it was repeated it meant that nothing had really been achieved. Their expectations were too low. What are our expectations from the religious devotions we practice? When we come into the house of God, do we come seeking a true encounter with the Lord? The world is filled with those who go about their rituals in a superstitious way, somehow attributing power to physical ceremonies which they do not have. Religion that does not bring us to know God is worth little. Religion that does not recognise the great problem of sin and our alienation from God, that does not address this great issue and provide a solution which is acceptable to God himself, is not worth pursuing. There is only one Saviour provided to this world, the Lord Jesus Christ. Only he can save us from the consequences of sin, and therefore anything that stands in the way of our coming to him is the enemy of our souls.
Assurance of forgiveness is what every worshipper of God should strive for. We should not think that because we are on earth and God is in heaven, it is impossible for us to know what he has done. Through the promises of God a person can be certain that God has forgiven them: this is one of the wonderful gifts of God that comes with conversion.