Imām Thābit Al-Bunānī said:
Glad tidings for the one who remembers the hour of death. No servant frequently remembers death except that it is reflected in their actions.
Ḥilyat Al-Awliyāʾ (2/325)
Admonition
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Related nuggets

Al-Imām Sufyān Ibn ʿUyaynah Al-Makkī said:
Whoever sows goodness will reap joy, and whoever sows evil will reap regret. You commit evil deeds and hope to be rewarded with good deeds? Certainly not, just as grapes are not harvested from thorns.
Al-ʿIlal by ʿAbdullāh Ibn Aḥmad (2661)
Admonition
Amīr Al-Muʾminīn ʿUmar Ibn ʿAbd Al-ʿAzīz said:
Learn knowledge, for it is an adornment for the wealthy and assistance for the poor. I do not say that it is sought to gain wealth, but rather it calls to contentment (Qanāʿah).
Sīrat ʿUmar Ibn ʿAbd Al-ʿAzīz by Ibn ʿAbd Al-Ḥakam (p.151)
Knowledge Asceticism
ʿAlī ibn Abī Tālib said:
You will first be defeated at jihad with your hands, then jihad with your tongues, then jihad with your hearts. Any heart that does not recognize good nor denounce evil will be turned upside down.
Al-Muṣannaf by Ibn Abī Shaybah (38733)
Jihad