"The fruits of peace and tranquility... are the greatest goods... while those of its opposite, strife, are unbearable evils. Hence we ought to wish for peace, to seek it if we do not already have it, to conserve it once it is attained, and to repel with all our strength the strife which is opposed to it. To this end individual[s]... and in even greater degree groups and communities are obliged to help one another... from the bond or law of human society." [Marsilio dei Mainardini (c.1275-1342), Defensor Pacis]