In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Question to Imaam Muhammad Ibn Saaleh al-Uthaymeen: May Allaah have mercy upon a person who knows his limitations and worth- [Does this (saying) have an (established) source and has it been transmitted in a hadeeth?]
Answer: I do not know of an (established) source for it; however its meaning is correct. (That is) because when a person knows his (limitations and worth), he will be humble in the presence of his Lord. He will worship Allaah and will know that he is not free from being in need of Allaah in the twinkling of an eye. If he knows himself, he will know his status amongst the people and this knowledge will (prevent) him from being haughty towards them- because haughtiness is from the major sins and looking down on the people is from the forbidden affairs. That is why when the Prophet (sallal-laahu-alayhi-wasallam) warned against haughtiness (or pride), they (i.e. the people) said: “Everyone of us loves that his clothes and shoes are nice;’’ so he (sallal-laahu-alayhi-wasallam) said: “Indeed, Allaah is beautiful and He loves beauty; haughtiness (or pride) is to reject the truth and look down on the people.” So when a person knows his (limitations and worth), he will know his rank amongst the people. He will place himself in his (rightful) place; humble himself in the presence of his lord and in the presence of Allaah’s creation. And whoever humbles himself to Allaah, Allaah will raise him.
[Source: Noor Alad-Darb: cassette: 250]