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

To cite another example, knowledge is figuratively described as light, and ignorance as darkness. But reflect: Is knowledge sensible light or ignorance sensible darkness? Certainly not. These are only intelligible conditions, but when you wish to express them outwardly you call knowledge light and ignorance darkness and say, "My heart was dark and it became illumined." Now, the light of knowledge and the darkness of ignorance are intelligible realities, not sensible ones, but when we seek to express them outwardly, we are obliged to give them a sensible form (16:5)

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