To him ascend these hymns, these steed-swift prayers. He alone hears my words. All-mover, all-conqueror, conveyer of sacrifice, the Child, ever aiding, he assumes great power.
Rig Veda I, 145, 3
He is a being; of flood and forest who passes aloft. Knowing the Law, he inspires to right action, this wise and true Lord.
Rig Veda I, 145, 5
Know the atman to be the master of the chariot; the body, chariot; the intellect, the charioteer; and the mind, the reins.
Yajur Veda, Katha Upanishad, Part One, Chapter III, 3
The senses, they say, are the horses; the objects, the roads. The wise call the atman-united with the body, the senses and the mind-the enjoyer.
Yajur Veda, Katha Upanishad, Part One, Chapter III, 4
If the buddhi, being related to a mind that is always distracted, loses its discriminations, then the senses become uncontrolled, like the vicious horses of a charioteer.
Yajur Veda, Katha Upanishad, Part One, Chapter III, 5