Sufyan on Self-Talk: Negative voluntary thoughts are blameworthy

Abu Talib al-Makki reported: Sufyan al-Thawri, may Allah have mercy on him, said, “I was deprived of the night prayer for five months because of a sin I committed.” It was said, “What was it?” Sufyan said, “I saw a man weeping and I said to myself: This one is showing off.”

Source: Qūt al-Qulūb 1/75

عن أبي طالب المكي قَالَ سفيان الثوري رحمه الله حُرمت قيام الليل خمسة أشهر بذنب أذنبته قيل له ما هو قال رأيت رجلاً بكى فقلت في نفسي هذا مراء

1/75 قوت القلوب في معاملة المحبوب