Devotional service to the Lord is very much obliging to Him. There are many transcendentalists in different fields of spiritual activities, but devotional service to the Lord is unique. Devotees do not ask anything from the Lord in exchange for their service. Even the most desirable liberation is refused by devotees, although offered by the Lord. Thus the Lord becomes a kind of debtor to the devotees, and He can only try to repay the devotees’ service with His ever-enchanting smile. The devotees are ever satisfied by the smiling face of the Lord, and they become enlivened. And by seeing the devotees so enlivened, the Lord Himself is further satisfied. So there is continuous transcendental competition between the Lord and His devotees by such reciprocation of service and acknowledgement.

Srila Prabhupada, SB 3.8.27, Purport