Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great. - Mark Twain the reason mother should be kept away.
"Don't worry about what the world wants from you, worry about what makes you come more alive. Because what the world really needs are people who are more alive. Your real job is to increase the color and zest of your life.