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.... If a man speaks or acts with a pure
thought, happiness follows him, like a shadow that never leaves him.
-- F. Max Muller (translator).
The Dhammapada (1, 2),