نِعْمَتَانِ مَغبونٌ فيهما كَثيرٌ مِنَ النَّاسِ الصِّحَّةُ ، وَالفَرَاغُ
The two most undervalued assets by people are good health and leisure time.
—The Prophet Muḥammad
[Bukhārī 5933, Tirmidhī 2226, Ibn Mājah 4160, Aḥmad 2224, 3038, Dārimī 2591, Riyad al-Saliheen #97]