Some people in whom the reason has developed have got the habit of entering into unnecessary controversies and discussions. They have got Tarkika Buddhi. They cannot remain quiet even for a second. They will create opportunities for heated debates. Too much discussions end in enmity and hostility. Much energy is wasted in useless discussions. Intellect is a help if it is used in the right direction of Atmic Vichara. Intellect is a hindrance if it is used in unnecessary discussions. Intellect takes the aspirant to the threshold of intuition. Thus far and no further. Reason helps in inferring the existence of God and finding out suitable methods for Self-realisation. Intuition transcends reason but does not contradict reason. Intuition is direct perception of Truth. There is no reasoning here. Reasoning concerns matters of the physical place. Wherever there is 'why' and 'wherefore,' there is reasoning. In transcendental matters which are beyond the reach of reason, reason is of no use.
Intellect helps a lot in reflecting and ratiocination. But people in whom reasoning is highly developed become sceptical. Their reason becomes perverted also. They lose faith in Vedas and in the teachings of Mahatmas. They say, "We are rationalists. We cannot believe anything which does not appeal to our reason. We do not believe the Upanishads. We reject anything that does not come within the domain of reason. We have no faith in God and Sat-Gurus." These so-called rationalists are a type of atheists only. It is very difficult to convince them. They have an impure, perverted reason. Thoughts of God cannot enter their brains. They will not do any kind of spiritual Sadhana. They say, "Show us your Brahman of the Upanishads, or Isvara of the Bhaktas." Those who are of doubting nature will perish. Reason is a finite instrument. It cannot explain many mysterious problems of life. Those who are free from the so-called rationalism and scepticism can march in the path of God-realisation.
Give up arguing. Become silent. Look within. All doubts will be cleared. You will get a flash of divine knowledge. The pages of the internal book of divine knowledge will be clearly revealed to you. Practise this and feel.
Aspirants should not indulge in sundry talks and miscellaneous thoughts just to ease the mind. They should be serious. They should think and talk of God alone.
(pgs. 175-176, Concentration and Meditation by Swami Sivananda)