One of my Lenten season disciplines this year is to read the daily texts from the Office of Readings. I bought the 4-volume Liturgy of the Hours set last year, yet have been sporadic in my readings. I have enjoyed the readings, and found them very helpful. This excerpt from Irenaeus made a strong impact on me, particularly the bolded phrase:
…Nor did the Lord need our service. He commanded us to follow him, but his was the gift of salvation. To follow the Saviour is to share in salvation; to follow the light is to enjoy the light. Those who are in the light do not illuminate the light but are themselves illuminated and enlightened by the light. They add nothing to the light; rather, they are beneficiaries, for they are enlightened by the light.
The same is true of service to God: it adds nothing to God, nor does God need the service of man. Rather, he gives life and immortality and eternal glory to those who follow and serve him. He confers a benefit on his servants in return for their service and on his followers in return for their loyalty, but he receives no benefit from them. He is rich, perfect and in need of nothing.
The reason why God requires service from man is this: because he is good and merciful he desires to confer benefits on those who persevere in his service. In proportion to God’s need of nothing is man’s need for communion with God.