“He who takes himself to account gets benefitted, and the one who gets negligent and careless about himself bears loss. The one who fears (Allah) becomes peaceful, and the one who takes lesson becomes most clear sighted and discerning. He who becomes most clear sighted, understands; and he who understands and comprehends becomes knowledgeable and informed.”
Majlisi, Bihārul Anwār, vol.78, p. 352.
Religious Wisdom
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Ali al-Rida 24
eighth of the Twelve Imams 770–818Related quotes
Source: To Understand Each Other
Torture and Resistance in Iran, 1971

Kein Mensch kann sich selbst je verstehen, denn dazu müßte er aus sich selbst herausgehen, dazu müßte das Subjekt des Erkennens und Wollens Objekt werden können: ganz wie, um das Universum zu verstehen, ein Standpunkt noch außerhalb des Universums erforderlich wäre.
Source: Sex and Character (1903), pp. 105-106.

As quoted in "Husayn ibn Mansur al-Hallaj" at Sidi Muhammad Press http://www.sufimaster.org/teachings/husayn.htm
Context: In the Name of Allah the Merciful, the Compassionate, Who manifests Himself through everything, the revelation of a clear knowing to whomsoever He wishes, peace be upon you, my son. This praise belongs to Allah Who manifests Himself on the head of a pin to whom He wishes, so that one testifies that He is not, and another testifies that there is none other than He. But the witnessing in the denying of Him is not rejected, and the witnessing in the affirming of Him is not praised.

Riyadh-as-Saliheen by Imam Al-Nawawi, 647 https://bewley.virtualave.net/riyad4.html
Sunni Hadith

Riyadh-as-Saliheen by Imam Al-Nawawi, volume 2, hadith number 311
Sunni Hadith

“To gulp down anger is the most courageous act one can perform. One who does it becomes humble.”
5:1857.
Lord Meher (1986)