“Persons desirous of (long) life, which is the means (instrument) for achieving dharma (righteousness), artha (wealth) and sukha (happiness) should repose utmost faith in the teachings of Ayurveda”; thus said Atreya and the other great sages.” ~ Ashtanga Hrdayam
This famous quote is from the Ashtanga Hrdayam, one of the most important classical Ayurvedic texts. It was written by the sage Vagbhata about 6-700 CE (Common Era).