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

But the truly learned among the Theosophists and Sufis have concluded, after deep consideration of this matter, that there are two kinds of existence. One kind is this common existence which is conceived by the mind of man. This existence is originated and is an accident among others, whereas the realities of things are the substances. But what is meant by unity of existence is not this commonly perceived existence, but that real Existence which is sanctified and exalted above all expression, an Existence through which all things are realized. This Existence is one; it is that One through which all things- such as matter, energy, and that common existence which is conceived by the human mind- have come to exist. This is the truth behind what the Theosophists and the Sufis believe (82:12)

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