Dhammapada 1

All that we are is the result of what we have thought: it is founded on our thoughts, it is made up of our thoughts. 

If a man speaks or acts with an evil thought, pain follows him, as the wheel follows the foot of the ox that draws the carriage. 

(all quotes from the Dhammapada in these entries are from the  F. Max Müller translation, 1881)