He who civilly shows the way to one who has missed it, is as one who has lighted another's lamp from his own lamp; it none the less gives light to himself when it burns for the other. [Lat., Homo qui erranti comiter monstrat viam, Quasi lumen de suo lumine accendit, facit: Nihilominus ipsi luceat, cum illi accenderit.]

Quintus Ennius