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: Sir John Phillip William Dankworth, known in his early career as Johnny Dankworth, was an English jazz composer, saxophonist and clarinetist. He was the husband of jazz singer Dame Cleo Laine, who survives him; they married in 1958.