Al-Khiṣāl #658“Four things are done in vain: being friends with disloyal ones; doing good to ungrateful ones; teaching those who do not listen; and...
Man Lā Yaḥḍuruh al-Faqīh #951"Four things are wasted in vain:
Affection granted to one who has no loyalty,
A favor bestowed upon one who does not appreciate...