In spiritual training, a disciplined mind is everything.
If your mind is empty, it is always ready for anything; it is open to everything. In the beginner's mind there are many possibilities; in the expert's mind there are few. - Shunryu Suzuki-roshi
Only in quiet waters do things mirror themselves undistorted. Only in a quiet mind is adequate perception of the world. - Hans Margolius
A mind ever free of its own process Beholds the True miracle of Absolute Reality. A mind ever lost in its own process sees only the forms of this world. - Tao Te Ching
It is certain that the nature of the mind is empty and without any foundation whatsoever. Your own mind is insubstantial like the empty sky. - Padmsambhava
Develop the quiet, even state of mind, when praised by some, condemned by others. Free the mind from hate and pride and gently go your way in peace. - The Buddha
If a man can control his mind he can find the way to Enlightenment, and all wisdom and virtue will naturally come to you. - Buddha
By a tranquil mind I mean nothing else than a mind well ordered. - Marcus Aurelius