Canonical Reference: Dhp 204 Verified Source

“Health is the greatest gift, contentment the greatest wealth, a trusted friend the best relative, and Nibbana the highest bliss.”

Canonical Pali Original: Ārogyaparamā lābhā, santuṭṭhiparamaṃ dhanaṃ; Vissāsaparamā ñāti, nibbānaṃ paramaṃ sukhaṃ.

— Gautam Buddha
The Awakened One, Founder of Dhamma
Historical Setting & Context:

Pali Canon: Dhammapada 15.204 on the true foundations of enduring peace and well-being.