Source: https://www.al-islam.org/nahjul-balagha-part-2-letters-and-sayings

Hadith n. 281

281. Amir al-mu’minin, peace be upon him, said: Perception by the eyes is not real observation because the eyes sometimes deceive people; but wisdom does not deceive whomsoever it counsels.

Hadith n. 282

282. Amir al-mu’minin, peace be upon him, said: Between you and the preaching there is a curtain of deception.

Hadith n. 283

283. Amir al-mu’minin, peace be upon him, said: The ignorant among you are excessive in their deeds (without knowledge) while your learned fall short (in their deeds).

Hadith n. 284

284. Amir al-mu’minin, peace be upon him, said: Knowledge dispels the excuse of those who advance excuses.

Hadith n. 285

285. Amir al-mu’minin, peace be upon him, said: He whom death overtakes early seeks time while he whose death is deferred puts forth excuses for postponement (of doing good actions).