Allah T’ala says in the Quran, Surah Al-Qalam (68:04):
“wa innaka la 'alaa khuluqin adheem”
And most definitely you (Prophet Muhammad (s.a.a.w.) are upon a very great and powerful disposition, character and mannerism.
A few ayaat earlier, Allah told His Messenger (s.a.a.w.) that he is not crazy, as his enemies try to defame him. For him is a reward from Allah T’ala without limit. And most definitely he is upon a great character.
Remember that the disbelievers of Makkah wanted to defame and character assassinate the Messenger of Allah. They would say evil things about the Messenger of Allah;
i.e. they would say he breaks up a son from his father (i.e. a son may leave his father’s religion), and they would say that he does not obey his tribes’ leaders (who called to polytheism) etc.
So the disbelievers would accuse him of doing evil to repel others from accepting Islam.
So Allah sent these ayaat to negate all these lies and character assassinations of the disbelievers by simply saying one line:
wa INNAka LA 'ala khuluqiN AdhEEmiN
And SURELY you are SURELY upon CONTINUOUSLY Great Mannerism.