Bhag 7.7.55
In summing up his sermon to the asura boys Sri Prahlada concludes;
etAvAneva loke'smin puMsah svArthah parah smRtah/
ekAntabhakti govinde yat sarvatra tadIkSaNam//
This much has been assertained as man's ultimate self-interest in this world; that there should be exclusive devotion to Govinda and to percieve his presence everywhere.