'Hard' in the Bible

not a hard drinker nor given to blows; not selfish or quarrelsome or covetous;

To this end we work hard and struggle, because we have set our hope on the living God, who is the Savior of all people, that is, of those who believe.

The elders who are good leaders should be considered worthy of an ample honorarium, especially those who work hard at preaching and teaching.