Three stone masons in the middle ages were hard at work when a visitor came along and asked them what they were doing.
The first stone mason was hard at work, sweat beading his brow. “I am cutting this stone”, he grumbled.
The second stone mason, though less distraught, responded with a deep sigh, “I’m building a parapet”.
The third stone mason, replied with a radiant face, “I am building a cathedral that will glorify God for centuries to come”.