Mortal men should pledge themselves to moderate friendships only, not to such as reach the very heart's core. Hippolytus (-428)
Moderate fortune has a name that is fairest on the tongue, and in practice it is by far the most beneficial thing for mortals. Medea (-431)
But greatness that doth o'erreach itself, brings no blessing to mortal men; but pays a penalty of greater ruin whenever fortune is wroth with a family. Medea (-431)