The Supreme Lord, the Supreme Personality of Godhead, is always fully satisfied in Himself. Therefore when something is offered to Him, the offering, by the Lord’s mercy, is for the benefit of the devotee, for the Lord does not need service from anyone. To give an example, if one’s face is decorated, the reflection of one’s face in a mirror is also seen to be decorated.
(Prahlada prays to Lord Nrsimhadeva (Bhag 7.9.11)
My dear Prahlada, you are very fortunate. Please know from Me that those who are very wise and highly elevated try to please Me in all different modes of mellows, for I am the only person who can fulfill all the desires of everyone.
(Lord Nrsimhadeva speaks to Prahlada (Bhag 7.9.54)
A person who accepts the path of devotional service is not bereft of the results derived from studying the Vedas, performing austere sacrifices, giving charity, or pursuing philosophical and fruitive activities. Simply by performing devotional service, he attains all these, and at the end he reaches the supreme eternal abode.
(Lord Sri Krsna, (Bhagavad-gita 8.28)