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

Therefore, by "spirit" is meant divine grace; by "water", knowledge and life; and by "fire", the love of God. For material water cleanses not the heart of man but his body. Rather, the heavenly water and spirit, which are knowledge and life, cleanse and purify the heart of man. In other words, the heart that partakes of the outpouring grace of the Holy Spirit and becomes sanctified is made goodly and pure. The purpose is that the reality of man be purified and sanctified from the defilements of the world of nature, which are vile attributes such as anger, lust, worldliness, pride, dishonesty, hypocrisy, deceit, self-love, and so on (19:6)

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