The Sayings And Preaching of Al-Imam Ali (p.b.u.h)
279. Amir al-mu’minin, peace be upon him, said: When optional issues stand in the way of obligatories, abandon them.
Hadith n. 280
280. Amir al-mu’minin, peace be upon him, said: Whoever keeps in view the distance of the journey remains prepared.
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.
Source: https://www.al-islam.org/nahjul-balagha-part-2-letters-and-sayings