Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

These are theoretical arguments adduced for weak souls, but if the eye of inner vision be opened, a hundred thousand clear proofs will be seen. Thus, when man feels the indwelling spirit, he is in no need of arguments for its existence; but for those who are deprived of the grace of the spirit, it is necessary to set forth external arguments (2:8)

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