[raison d'etre = reason or justification for existence]
Though every man does possess the faculty of a reasoning mind, it is not capable of just and fair reasoning until properly developed. Till then man's response to the insistence of his impulses is based on his intelligence and a priori logic. His judgment is then devoid of conscious reasoning. In fact, the logic is often so tinged by the intense impulses that they overwhelm the supposed reasoning. At such times, reasoning seeks proofs to justify the action demanded by the instincts. Thus, it is essential to develop and evolve the reasoning mind in order to countermand the impelling forces of primal urges.