Those individuals who have cultivated the development of the reasoning intelligence and shifted their standpoint to that basis tend to see it as the ultimate arbiter of what is true and how things should be interpreted. They tend to close their eyes to the limitations of the reasoning intelligence and even try to interpret the psychic and spiritual realms and the experience of intuition on the basis of whether the reasoning intelligence finds some kind of logical and factual support for those experiences. We thus frequently find that the logical mind refuses to accept the reality or importance of psychic and spiritual experiences, discounting them as not subject to the kind of proof that the intellect requires, and this becomes a serious obstacle to progress if the mind stands in the way of further development by discounting the reality of what takes place in the spiritual evolution.
Sri Aurobindo observes: “Made confident by success and predominance, by the comparative greatness of its own light, it regards itself as a thing primary and absolute, assures itself of its own entire truth and sufficiency and endeavours to become the absolute ruler of mind and life. This it cannot do successfully, because it depends on the lower life intuition and covert supermind and its intuitive messages for its own real substance and existence. it can only appear to itself to succeed because it reduces all its experience to rational formulas and blinds itself to half the real nature of the thought and action that is behind it and to the infinite deal that breaks out of its formulas. The excess of the reason only makes life artificial and rationally mechanical, deprives it of its spontaneity and vitality and prevents the freedom and expansion of the spirit. The limited and limiting mental reason must make itself plastic and flexible, open itself to its source, receive the light from above, exceed itself and pass by an euthanasia of transformation into the body of the supramental reason. Meanwhile it is given power and leading for an organisation of thought and action on the characteristically human scale intermediate between the subconscient power of the spirit organising the life of the animal and the superconsicent power of the spirit which becoming conscient can organise the existence and life of a spiritual supermanhood.”
Sri Aurobindo, The Synthesis of Yoga, Part Four: The Yoga of Self-Perfection, Chapter 23, The Supramental Instruments — Thought-process , pp. 819-820