But if you should take the bond of goodwill out of the universe no house or city could stand, nor would even the tillage of the fields abide. If that statement is not clear, then you may understand how great is the power of friendship and of concord from a consideration of the results of enmity and disagreement. For what house is so strong, or what state so enduring that it cannot be utterly overthrown by animosities and division?
Marcus Tullius CiceroAs the scale of the balance must give way to the weight that presses it down, so the mind must of necessity yield to demonstration.
Marcus Tullius Cicero