2-70 Muhammad ibn Musa ibn al-Mutevakil - may God be pleased with him - narrated that Muhammad ibn Yahya al-Attar quoted Muhammad ibn Ahmad, on the authority of Ali ibn Hisan al-Vaseti, who linked it up to Zurarah, on the authority of Aba Abdullah as-Sadiq (MGB) who said
“Two characteristics are due to true faith. The first one is that you prefer the truth over the false, even if it may be to your disadvantage. The second one is that what you say is not beyond your intellect.”