Umayr on Belief: Faith increases if we remember our Lord

Abu Ja’far reported: ‘Umayr ibn Habib, may Allah be pleased with him, said, “Faith increases and decreases.” It was said, “How does it increase and decrease?” ‘Umayr said, “If we remember our Lord and fear him, it will increase. If we are heedless and we forget and we waste our time,  it will decrease.”

Source: Shu’ab al-Imān 55

عَنْ أَبِي جَعْفَرٍ الْخَطْمِيِّ عُمَيْرِ بْنِ حَبِيبِ رضي الله عنه أَنَّهُ قَالَ الإِيمَانُ يَزِيدُ وَيَنْقُصُ فَقِيلَ لَهُ وَمَا زِيَادَتُهُ وَمَا نُقْصَانُهُ قَالَ إِذَا ذَكَرْنَا رَبَّنَا وَخَشَيْنَاهُ فَذَلِكَ زِيَادَتُهُ وَإِذَا غَفَلْنَا وَنَسِينَا وَضَيَّعْنَا فَذَلِكَ نُقْصَانُهُ

55 شعب الإيمان للبيهقي باب القول في زيادة الإيمان ونقصانه