Intelligence in Action
It is reported that Sufyān b. ‘Uyainah – Allāh have mercy on him – said, “The intelligent person is not one who merely knows what is good and what is bad. The intelligent person is one who, when he sees what is good, follows it, and when he sees evil, shuns it.”
Abū Nu’aym, Hilyah Al-Awliyā`, Vol. 4 p16.
Also read
Related sayings.
A person is not knowledgeable enough to give verdicts and not considered a scholar unless he knows differences of opinions.
The Salaf used to be careful not to speak in front of elders unless absolutely needed.