Hazrat Shaikh Moulana Muhammad Zakariyya (rahmatullahi ‘alaih) once mentioned the following:
Do not allow self-admiration to enter your heart over any achievement. Self-admiration is such a destructive sin that even in the presence of Rasulullah (sallallahu ‘alaihi wasallam), at the Battle of Hunain, it caused the Muslims to suffer difficulty.
(Qutbul Aqtaab Hazrat Shaikhul Hadith Moulana Muhammad Zakariyya [rahmatullahi ‘alaih] pg. 426)
Source: Ihyaauddeen.co.za