When your private (conduct) is the same as your public, then that is good character, when your privacy is better than your public appearance, then that is virtue, and when your public appearance is better than your private, then transgression.

—Sufyān b. ‘Uyaynah [d. 198H/813CE]

Tarikh Baghdad (13/173)

(Read on pg 230, Salahuddin Ali Abdul Mawjood, Imam Sufyan Ibn Uyaynah. Darussalam. Riyadh: 2006.)