Never grope for it yourself, or you'll get lost when you ask for directions. This sentence can be understood as that you can get twice the result with half the effort with the help of external forces in the process of growing up, but you can't trust the past or other people's experience too much, because experience may be misleading because of different time and environment. There is a saying that it is better to believe it, not to believe it, and it is important to have your own judgment.