Do not be arrogant

بِسْمِ اللّهِ الرَّحْمـَنِ الرَّحِيمِ

Al-A'raf (The Heights) - 7:146. From My messages shall I cause to turn away all those who, without any right, behave haughtily on earth: for, though they may see every sign [of the truth], they do not believe in it, and though they may see the path of rectitude, they do not choose to follow it-whereas, if they see a path of error, they take it for their own: this, because they have given the lie to Our messages, and have remained heedless of them,"


Do not be arrogant enough to think you are all-knowledgeable

The representative character of Muslim scholars used to be humility.  And this is something that we need to revisit. There are many proofs of this, but for now, I will only quote this story narrated by Qadi Abu Bakr ibn al-‘Arabi in his "عارضة الأحوذي   Aridhat al-Ahwazi'" a commentary on Imam Tirmidhi's hadith collection.

A man was praying in the masjid beside Ibn al-Shihab al-Zuhri who was the leading authority on matters of jurisprudence on behalf of the government at that time.  Observing that the man did two two tasleema at the end of his prayers, Ibn al-Shihab asked him where he was from, as it was the norm to do only one tasleema at that time.

The man replied, "Kufa".

Ibn al-Shihab asked him further:
"Where do you get this second tasleema from?"

The man responded:
"Ibrahīm al-Nakha'ī told me that he heard from  'Alqamah Ibn Qays who learnt from  'Abdullāh Ibn Mas'ūd (رضي الله عنه)."

Ibn al-Shihab said :
"I have never heard of this"

The man responded:
"Are you aware of all the hadith of the Prophet  ﷺ ?"

Ibn al-Shihab replied, humbly :
"No"

The man continued :
"Then perhaps two-thirds of those?"

Ibn al-Shihab replied, again, humbly :
"No"

The man pressed on :
"Then perhaps half?"

Ibn al-Shihab said :
"Yes"

Here the narrator was in doubt that it might have been one-third.

So the man said to Ibn al-Shihab:
"Then you should place this hadith among the two-thirds that you have not seen yet"
 
Hearing this, Ibn-al-Shihab, the leading religious authority of the time (at least in the government), rather than rebuking him or getting angry, simply laughed, and left the man alone.  I am sure that nowadays we have plenty of people who know far less than Ibn al-Shihab al Zuhri, and if faced with such a situation, would have reacted rather harshly, and full of self-righteous condemnation for something different from their understanding.