The happiness and prosperity of mankind, arising from the social virtue of benevolence and its subdivisions, may be compared to a wall, built by many hands; which still rises by each stone, that is heaped upon it, and receives encrease proportional to the diligence and care of each workman. The same happiness, raised by the social virtue of justice and its subdivisions, may be compared to the building of a vault, where each individual stone would, of itself, fall to the ground; nor is the whole fabric supported but by the mutual assistance and combination of its corresponding parts.
David Hume, social engineer
