ἔργοισι χρηστός, οὐ λόγοις ἔφυν μόνον → a friend in deeds, and not in words alone
answer: P. and V. ἀπόκρισις, ἡ (Eur., Fragment), P. ὑπόληψις.
defence: P. ἀπολογία, ἡ.