Sri Aurobindo
Letters of Sri Aurobindo
06. Transformation of the Mind
Intelligence does not depend on the amount one has read, it is a quality of the mind. Study only gives it material for its work as life also does. There are people who do not know how to 
read and write who are more intelligent than many highly educated people and understand life and things better. On the other hand, a good intelligence can improve itself by reading because it gets more material to work on and grows by exercise and by having a wider range to move in. But book-knowledge by itself is not the real thing, it has to be used as a help to the intelligence but it is often only a help to stupidity or ignorance – ignorance because knowledge of facts is a poor thing if one cannot see their true significance.