C.S Lewis gave this speech in 1947 and the ideas are as relevant today as they were back then. My favorite concept is that there are two systems of influence in any organization: the official one and the unofficial one. There are explicit org charts and implicit ones. Train yourself to make sense of the implicit ones, where the true dynamics of power lie. Also, if you’re a C.S. Lewis fan, you’ll like my essay: Why You’re Christian (Essay).