Here is a very important benefit along with many others that can be found in the lecture titled: The Methodology of the Prophet in Calling to Allah by Abu Uwais Abdullah Ali (rahimahullah Ta'ala).
He (rahimahullah Ta'ala) brings a benefit to demonstrate the importance of understanding tawheed. He gives the example of people reaction to crime of homosexuality and their reaction to someone who swears by other than Allah.
Which of these two crimes is the more grave sin? If you don't know, then it is time to get back to studying tawheed. Listen to what Abu Uwais (rahimahullah Ta'ala) brings about the leader of the Suroori's, whose name was Muhammad Suroor and his deviant misunderstanding.
Abu Hurairah (رضي الله عنه) narrated that the Prophet ﷺ said: "Whoever invites to guidance will be rewarded like those who follow him in the guidance are rewarded, and that will not decrease the reward of those who have followed him." [Collected by Imām Muslim]
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