Yūnus b. ʿUbayd

There is no one who is mindful of what he says except that you will see the good of it in the rest of his actions.

Ibn Abī Al-Dunyā, Al-Ṣamt wa Ādāb Al-Lisān article 60.

I do not know anything rarer than a good dirham (money earnt lawfully) whose owner spends it on something right, or a brother in Islām in whose company one finds peace. And they are only getting rarer.

Abu Nu’aym, Hilyatu Al-Awliyā` 3:17

I only liken the worldly life (dunyā) to a man who, whilst sleeping, sees in his dream things he likes and things he does not like. Then he wakes up (the world ends and the next life starts).

Ibn Abī Al-Dunyā, Dham Al-Dunyā article 21.