This is a verse from Srimad-Bhagavatam (6.17.28) regarding the personality Citraketu. Once when Citraketu saw the goddess Parvati sitting on the lap of Lord Sambhu (Siva), he criticized Lord Siva for being shameless and sitting just like an ordinary man with his wife on his lap. For this reason Citraketu was cursed by Parvati. Later he became a demon named Vrtrasura. Citraketu was a very powerful king and a devotee, and he could certainly retaliate even against Lord Siva, but when Parvati cursed him, he immediately accepted the curse with a bowed head. When he agreed to accept this curse, Lord Siva praised him and told Parvati that a devotee of Lord Narayana is never afraid of accepting any position provided there is a chance to serve the Supreme Personality of Godhead. This is the purport of narayana-parah sarve na kutascana bibhyati.