Imam Ali (AS) said:

Then, when Allah (SWT) observed our truthfulness and devotion, inflicted indignity and humiliation on our enemies and granted victory to us, to the extent that Islam has strengthened and spread and its influence penetrated far reaching lands. Swear on my life, if we were like you in combat, no firm base would have been left for the religion, and no branch of the tree of belief would have turned green [1].

[1] Nahjul Balaghah, Sermon 56.

Source: en.shafaqna.com