To solve a problem or to reach a goal, you don't need to know all the answers in advance. But you must have a clear idea of the problem or the goal you want to reach.
Bio: Dennis Flanagan was the founding editor of the modern Scientific American magazine. In 1947, Flanagan, Donald H. Miller, Jr. and Gerard Piel, under the leadership of Piel, acquired and reorganized the then 102-year-old Scientific American.