I think that there are excellent and poor thinking habits just as there are healthy and unhealthy eating habits; and when a man really knows how to think, you cannot necessarily assert that he thinks too much in a strictly negative connotation. Perhaps this is in a sense food for thought, whereas the other is fool for thought.

Diotima, Battery, Electric Personality: (ed. Criss Jami, 2013) - ISBN: 9781494430085