“What is called mind is a wondrous power existing in Self. It projects all thoughts. If we set aside all thoughts and see, there will be no such thing as mind remaining separate; therefore, thought itself is the form of the mind. Other than thoughts, there is no such thing as the mind.”

Book III Ch. 20 First Rule, para. 1 and 2.
Institutes of the Christian Religion (1536; 1559)

Nan Yar = Who am I?

Mind
Source: I am That, P.142.

Source: Ashtanga Yoga Primer, 1981, p.9

Canto I, stanza 8.
The Corsair (1814)

They are repetitive, producing mechanical activities which are a necessary part of existence. But they are only part, and thought and feeling cannot possibly enter into the immensity of life. Quite a different approach is necessary, not the path of habit, association and the known; there must be freedom from these. Meditation is the emptying of the mind of the known. It cannot be done by thought or by the hidden prompting of thought, nor by desire in the form of prayer, nor through the self-effacing hypnotism of words, images, hopes, and vanities. All these have to come to an end, easily, without effort and choice, in the flame of awareness.
Source: 1970s, Meditations (1979), p. 105

Source: The Lost Symbol

Source: Address on Laying the Cornerstone of the Bunker Hill Monument (1825), p. 71
Context: Mind is the great lever of all things; human thought is the process by which human ends are ultimately answered; and the diffusion of knowledge, so astonishing in the last half-century, has rendered innumerable minds, variously gifted by nature, competent to be competitors or fellow-workers on the theatre of intellectual operation.

Source: Silence Speaks, from the chalkboard of Baba Hari Dass, 1977, p.14