He is hunting for water in the sea.
More Latin Proverbs:
Have a care how you irritate the wasps. [Meddle not with waspish people. Attack not a combined force.]Latin
A good leader makes a good follower.
Latin
Keep your own counsel.
Latin
Teach an eagle to fly, a dolphin to swim.
Latin
Virtue and valour rejoice in being put to the test.
Latin
He is but a poor husbandman, who sows in sand.
Latin