Islam - The intellect: Imam Ali (as)

The intellect is an honourable nobility that does not wear away.

The intellect is an inborn quality that increases through knowledge and experience.

The intellect and knowledge are joined together in one linkage, they neither separate not do they differ.

The intellect is the greatest of riches and the highest honour in [both] the Hereafter and this world.
The intellect is the most beautiful adornment and knowledge is the most honourable merit.

The intellect is the root of knowledge and the herald of understanding.

Intelligence is an advantage, knowledge is an elevation and patience is a defence [and a means of repelling hardships].

The intellect is the close friend of a believer, knowledge is his vizier, patience is the commander of his army and action is his overseer.

The intellect is the learder of the army of the Most Merciful and vain desire is the chief of the army of Satan, and the soul is pulled back and forth between them, so whichever of them is victorious, it is on its side.

Intelligence is for you to be moderate and not indulge in extravagance, to promise and not to break your promise, and to be forbearing when you get angry.
Intelligence is for you to speak [only] of what you know and to act upon what you say.
Intellect and lust are opposites; the supporter of the intellect is knowledge and the adorner of lust is vain desire, and the soul is contended for between the two, so whichever is triumphant, it is on its side.
The intellect guides and saves whereas ignorance misleads and destroys.

The intellect is a praiseworthy friend.

Seek right guidance from the intellect and oppose vain desire, [by this] you will gain success.

Fetter your intellect, control your affair, struggle with your [lower] self, and exert your effort in working for the Hereafter.

Where are the intellects that light up ( or that accompany) the lamps of guidance?

The best intellect is [that which leads one to] right guidance.

The best of blessings is the intellect.

The beginning of intelligence is being friendly [with the people].

The best intelligence is [that which leads to] good ettiquette.

The best intelligence is keeping away from idle sport.

The best intelligence is for a person to know his self, for the one who knows his self becomes wise and the one who fails to know it goes astray.

The best intelligence is taking lesson [from the past], the best prudence is precaution and the biggest foolishness is being deceived [by worldly allures].