Some Ans. Questions 1908 by -'Abdu'l-Bahá- 1 Para

The human spirit which distinguishes man from the animal is the rational soul, and these two names-- the human spirit and the rational soul-- designate one thing. This spirit, which in the terminology of the philosophers is the rational soul, embraces all beings, and as far as human ability permits discovers the realities of things and becomes cognizant of their peculiarities and effects, and of the qualities and properties of beings. But the human spirit, unless assisted by the spirit of faith, does not become acquainted with the divine secrets and the heavenly realities. It is like a mirror which, although clear, polished and brilliant, is still in need of light. Until a ray of the sun reflects upon it, it cannot discover the heavenly secrets (208:5)

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