Underlying all the principles of effectual reasoning is a coherent logic that rests on a fundamentally different assumption about the future than causal reasoning. Causal reasoning is based on the logic, To the extent that we can predict the future, we can control it. That is why both academics and practitioners in business today spend enormous amounts of brainpower and resources on developing predictive models. Effectual reasoning, however, is based on the logic, To the extent that we can control the future, we do not need to predict it.

From What Makes Entrepreneurs Entrepreneurial.