It might be, though, that you witness at a door, at work, in school, or in an informal setting, and unknown to you, it becomes the avenue for spreading truth to others.
لَمْ يَخْطُرْ عَلَى بَالِ رَايِنْ إِطْلَاقًا أَنَّ شَهَادَتَهُ لِرَجُلٍ سَتُؤَدِّي إِلَى مَجِيءِ شَخْصٍ آخَرَ إِلَى ٱلْحَقِّ .‏