4-144 Muhammad ibn al-Hassan ibn Ahmad ibn al-Walid - may God be pleased with him - narrated that Muhammad ibn al-Hassan al-Saffar quoted Muhammad ibn Isa ibn Ubayd, on the authority of Ubaydullah ibn Abdullah al-Dihqan, on the authority of Durost ibn Abi Mansoor al-Vaseti, on the authority of Aba Abdullah as-Sadiq (MGB), “Four things are done in vain: being friends with disloyal ones; doing good to ungrateful ones; teaching those who do not listen; and entrusting secrets with those who would not safeguard them.”