ὃ σὺ μισεῖς ἑτέρῳ μὴ ποιήσεις → don't do to others what you don't want them to do to you
P. σκληρότης, ἡ, χαλεπότης, ἡ.
obstinacy: P. αὐθάδεια, ἡ, Ar. and V. αὐθαδία, ἡ.