“Begin with the end in mind” is based on the principle that all things are created twice. There’s a mental or first creation, and a physical or second creation to all things.
Take the construction of a home, for example. You created in every detail before you ever hammer the first nail into place. You try to get a very clear sense of what kind of house you want. If you want a family-centered home, you plan to put a family room where it would be a natural gathering place. You plan sliding doors in the patio for children to play outside. You work with ideas. you work with your mind until you get a clear image of what you want to build.
Then you reduce it to blueprint and develop construction plans. All of this is done before the earth is touched. If not, then in the second creation, the physical creation, you will have to make expensive changes that may double the cost of your home.
The carpenter’s rule is “measure twice, cut once.” You have to make sure that the blueprint, the first creation, is really what you want, that you’ve thought everything through. Then you put it into bricks and mortar. Each day you go to the construction shed and pull out the blueprint to get marching orders for the day. You begin with the end in mind.
Source: Covey, Stephen R. (1989, 2004). The 7 Habits of Highly Effective People. Free Press, p. 99.