Reactive people are often affected by their physical environment. If the weather is good they feel good. If it isnt it affects their attitude and their performance. Proactive people can carry their own weather with them. Whether it rains or shines makes no difference to them. They are value driven; and if their value is to produce good quality work it isnt a function of whether the weather is conducive to it or not. Excerpt From: Stephen R. Covey. "The 7 Habits of Highly Effective People"