Hazrat Moulana Muhammad Ilyaas (rahmatullahi ‘alaih) once mentioned:

Those involved in the work of tableegh should strive to inculcate a very high level of endurance and patience within them. The desired level of endurance and patience will be created when one has true love and concern for the Ummah. This quality will be engendered within their hearts by focusing and reflecting over the infinite mercy and compassion of Allah Ta‘ala for His creation. Thereafter, due importance should be shown towards one’s tarbiyat (i.e. improving one’s character). (Malfoozaat Hazrat Moulana Muhammad Ilyaas (rahmatullahi ‘alaih) pg. 40)

Source: Ihyaauddeen.co.za