J. Todd Murray, Beyond Amazing Grace:
The disparity between the angels’ worship and our own is especially ironic in the light of the fact that we have so much more to be grateful for than the angels do. When angels sinned just once, they were immediately judged by God and given no opportunity of redemption (2 Peter 2:4; Jude 6). Yet wicked humans, whose sins are so many and so great, are offered forgiveness through Jesus Christ. So, while the angels declare that the Lamb of God is worthy to be praised, they are merely objectively proclaiming the fact of his worthiness. However, when redeemed sinners like us worship the Lamb, our involvement is intensely personal. We praise the Lamb not merely because he suffered and was slain, but because he suffered for our sin and was slain for us. Since the angels have less to praise God for than we do, let us at the very least match their intensity in our worship now and look forward to a time in heaven when we might actually surpass them in our praise around the throne.