Faith is the ultimate essence of intellect. Through the practice of correct faith, the intellect comes to shine. Intellect without correct faith lacks a firm anchor in the soil of life and eventually becomes disordered. This prompted the first Soka Gakkai president, Tsunesaburo Makiguchi, to remark that many modern thinkers were suffering from what he termed “higher psychosis.” Faith without intellect, meanwhile, leads to blind faith and fanaticism. Faith or intellect alone–one without the other–is unhealthy.
from sgi.org