To begin with, having a plan enable you realize the clear goal. Well begun is half done, as the saying goes. If you know your ambitious, you would motivate yourself to learn more. For example, Liyanhong, the founder of the first on-line searching engine in China. He is wealthy person because his early major in Internet successfully gained him the first initial fund for his enterprise and paved the way for the success of Baidu Corporation. In any company, employer prefer the people who are well prepared. Obviously, how significant does hav a plan.
What's more, having a plan could cultivate the sense of responsibility and disciplined. A responsible people always know what he would do in the next step. Meanwhile, he understands which behaviour is forbidden in certain group. Take volunteers for an example, my friend and his collages devote their time and energy to establish a school in a poor country ,where children have no chance to attend to the class because of no money. They spend a long time to do this work, with a belief deep that their responsibilities are helping people without any request. They respect the rule and will be accepted by the public. Indeed, a plan could change a world.
Last but not the least, having a plan would use time efficiently. It can decrease unexpected things will happen, which made people control well and do well. For instance, if I am going to take GRE exam in October, the first thing I need to do is make a detailed plan about how to prepare it. I need 2 month to remember the words, then take another 2 month to taking courses and doing amount of exercises. Instead of watching movie or hanging