chained_bear commented on the word mackerel-snapper I get the fish-eater thing, but I don't know why non-Catholics wouldn't want mackerel--evidenced by the use of the term in a disparaging phrase. (Or wouldn't want snapper, for that matter.)
Psalm 1 is the first of the Psalms in the Hebrew Bible. Like many of the psalms, it contrasts the  righteous  person (tzadik ×¦×××§) to the wicked or ungodly (rasha` ×¨×©×¢) or the  sinner  (chatta' ×××).
One of those hymns was âJoy to the World,â based loosely on Psalm 98, which says, âMake a joyful noise to the Lord, all the earth; break forth into joyous song and sing praisesâ (Psalm 98:4). That psalm looks forward to the day when the Lord will come to judge the world in righteousness.