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: Mohammad Reza Shah Pahlavi was the Shah of Iran from 16 September 1941 until his overthrow by the Iranian Revolution on 11 February 1979. He took the title Shāhanshāh on 26 October 1967.