Timothy Leary, in his book 'The Intelligence Agents' refers to Crowley when he says that:

"There are three ways to increase your 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 are smart or smarter than you. We assume that you are the Intelligence Agent from you gene pool, so you will seek Intelligence Agents from other gene-pools who will stimulate you to get smarter.

For further reference on Leary, check out the 'Fusion Anomaly' site