All deeds are led by mind, created by mind.
If one speaks or acts with a corrupt mind,
suffering follows,
As the wheel follows the hoof of an ox pulling a cart."
"Mind is the forerunner of all actions.
All deeds are led by mind, created by mind.
If one speaks or acts with a serene mind, happiness follows,
As surely as one's shadow."
The above quote is the first two verses from the first chapter of the Dhammapada, entitled "Twins".
(The Dhammapada, The Path of Truth, page 9, translated by the Venerable Balangoda Ananda Maitreya, revised by Rose Kramer, published by Parallax Press in 1995)