Crossplanet

A traveller meets a man crushing stones by the road, he asks him what he is doing and the other answers angrily: "that's a really stupid job I have! hard and poorly paid!"

The traveller goes on, and a while after he meets another man, also crushing stones and asks him the same question. The other answers: "well, I make a living working in the open air, that's much better than working in an office!"

The traveller continues his journey and meets a third man, also crushing stones. This third man looks so happy! When asked what he is doing, he answers: "Don't you see? I am building a cathedral!"

So... whatever you do, the meaning you give to your own efforts, transforming reality, brings you happiness.