10-50 Muhammad ibn al-Hassan narrated that Muhammad ibn al-Hassan al-Saffar quoted Al-Hassan ibn Muawiyah, on the authority of Muhammad ibn Hammad - the brother of Yusuf ibn Himad al-Khazzaz, on the authority of Abdul Aziz al-Qaratisi,

“I went to see Aba Abdillah and told him about some of the issues of the Shias, and what they say. He (the Imam) said, ‘O Abdul Aziz! Belief has ten ranks, just like a ladder that has ten steps. One must climb it step by step.

One who has attained two of these ranks should not say to the one who has only attained the first rank, ‘You are not upon anything (You do not have faith).’

One who has attained three of these ranks should not say to the one who has only attained the first two ranks, ‘You are not upon anything.’

The same thing holds true up until the tenth rank.‘ He (the Imam) then said, ‘Salman was in the tenth (rank), Abu Dharr was in the ninth and Miqdad was in the eighth.

O Abdul Aziz! You should not consider anyone who has attained a rank lower than yourself to lack faith, so that those who have attained a higher rank than you have do not consider you to lack faith. When you see someone who is in a lower rank than you are, kindly assist him up to your rank, and do not force upon him what he cannot tolerate, since you may break him (hurt him) this way. One who breaks (hurts) a believer should help him get unhurt; because if you place the load that you would normally place on a nine-year old camel on a baby camel, you would break its back (and kill it).’”