As ever, there is more depth to Timothy Leary's writings than some have given him credit for.... so I quote his lines on 3 ways to increase one's intelligence:
1. Continually expand the scope, source, intensity of the information you receive.
2. Constantly revise your reality maps, and seek new metaphors about the future to understand what's happening now.
3. Develop external networks for increasing intelligence. In particular, spend all your time with people as smart or smarter than you.
- Timothy Leary, The Intelligence Agents