Amrtabindu Upanisad, verse 2

The mind alone is the cause of bondage and of freedom for human beings. Attached to objects it binds; free of objects it is remembered as liberation.

Katha Upanisad 1.3.3–4

Know the self as the rider, the body as the chariot, the intellect as the driver, and the mind as the reins.

Isha Upanishad 1

All this is inhabited by the Lord. Enjoy by letting go. Do not covet anyone’s wealth.

Katha Upanisad 1.3.3–4

Know the self as the rider, the body as the chariot, the intellect as the driver, and the mind as the reins.

How To Give: With Faith, Modesty And Understanding — Taittiriya Upanishad 1.11.3

Give with faith; do not give without faith. Give generously; give with modesty; give with respect (awe); give with understanding.

Taittiriya Upanishad 1.11.3

Give with faith; do not give without faith. Give generously; give with modesty; give with respect; give with understanding.