" A wandering sadhu or holy man is asked what his work in life is; he replies, ' I'am a farmer'. When the questioner looks surprised he adds, ' This body of mine is my field.I sow good thoughts and actions, and in my body I reap the results.' The Buddha explains, ' All that we are is the result of what we have thought: it is founded on our thoughts; it is made of our thoughts.' What we think, we become, for as Emerson says, the ancestor of every action is a thought. Thus our thoughts, taken together, bear fruits in the actions , decisions, desires, and so forth that shape our lives. In part, the body bears the fruit of what we think insofar as our way of thinking affects our health and safety. But in a larger sense, the whole field of
human activity... is also a 'field of karma' - where, for example, the global environment is shaped by the sum of what its inhabitants do, which in turn is shaped by how they think."
Taken from: The Bhagavad Gita, Translated For The Modern Reader By Eknath Easwaran