The effect of the preaching work is often seen years after the initial work has been done.
غَالِبًا مَا يَظْهَرُ تَأْثِيرُ عَمَلِ ٱلْكِرَازَةِ بَعْدَ سَنَوَاتٍ مِنْ سَمَاعِ ٱلنَّاسِ ٱلرِّسَالَةَ لِلْمَرَّةِ ٱلْأُولَى .‏