Hazrat Moulana Muhammad Ilyaas (rahimahullah) once said:
At the time when the jamaat goes out in the path of Allah Ta‘ala for gusht, it is important that the jamaat be reminded that when one brother speaks to any person in order to invite him to deen, then the other brothers in the jamaat should remain engaged in zikr and fikr (i.e. they should remember Allah Ta‘ala in their hearts, and have deep concern for the hidaayah of themselves and the person who is being addressed. Hence, they should also listen to the message while hoping for hidaayah from Allah Ta‘ala).
The secret behind adopting this approach is that at the time when the speaker will try to explain the reality of deen to the person and guide him towards deen, then at that time, if all the brothers’ hearts are filled with the correct and deep yaqeen upon Allah Ta‘ala and the Hereafter, the effect of their hearts will have a positive impact upon the heart of the person who is being spoken to.
Allah Ta‘ala has placed many positive effects in the hearts of people. However, most people are unaware of these positive effects.
(Malfoozaat Hazrat Moulana Muhammad Ilyaas (rahmatullahi ‘alaih) pg. 52)