20 And understand (this) also, from that which is of this world, those who labour with toil, and from the hired men who work with their fellows. There are some who hire their fellow-men by day-wages, and (these) receive the wage of their toil; and there are some who are hired for the month, and compute and receive the wage for the time, at the time agreed. And the day-wage is distinguished from the monthly wage; and yearly exceeds monthly wage.
Source: Demonstrations (New Advent)