Here is an example of giving service to the Supreme Personality of Godhead even without knowledge. Such service is called ajñāta-sukṛti. King Satyavrata wanted to show his own mercy, not knowing that the fish was Lord Viṣṇu. By such unknowing devotional service, one is favored by the Supreme Personality of Godhead. Service rendered to the Supreme Lord, knowingly or unknowingly, never goes in vain.