Al-Qushayri reported: Abu Bakr al-Farisi, may Allah have mercy on him, was asked about the practice of inward silence and he said, “It is to abandon preoccupation with the past and the future.”
Source: al-Risālah al-Qushayrīyah 1/247
عَن القشيرية وسئل أَبُو بَكْر الفارسي رحمه الله عَن صمت السر فَقَالَ ترك الاشتغال بالماضي والمستقبل
1/247 الرسالة القشيرية
