Sufyān ath-Thawrī’s good manners

Sufyān ath-Thawrī ^{[d. 161H]} (may Allāh have mercy upon him) said: “Sometimes a man will narrate a ḥadīth to me that I knew before his mother gave birth to him. However, out of good manners, I will listen to him (as though I did not know it).”