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' ×××).
The psalmist is a well-defined figure in the Bible. He works either as a Levite in a dual profession of an ordained cantor and priest, or in some cases, as a prophet, and is responsible for maintaining the necessary equilibrium between both the prophetic and priestly vocations, the intellect and the imagination.