To act means to produce a result. Many of us are doers, we love to accomplish things, reach goals, act on ideas, begin or complete projects, close deals, etc. But what happens when we go beyond action to reaction? Well obviously we still produce a result, but often it may not a positive one.

In fact, we may not be moving beyond at all - but backing up.

To react means to move in opposition to, in the opposite direction of and/or undergo a chemical change(reaction)