|Canto 3: The Status Quo||Chapter 20: Conversation Between Maitreya and Vidura|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 3.20.44
siddhān vidyādharāḿś caiva
tirodhānena so 'sṛjat
tebhyo 'dadāt tam ātmānam
siddhān — the Siddhas; vidyādharān — Vidyādharas; ca eva — and also; tirodhānena — by the faculty of remaining hidden from vision; saḥ — Lord Brahmā; asṛjat — created; tebhyaḥ — to them; adadāt — gave; tam ātmānam — that form of his; antardhāna-ākhyam — known as the Antardhāna; adbhutam — wonderful.
Then Lord Brahmā, by his ability to be hidden from vision, created the Siddhas and Vidyādharas and gave them that wonderful form of his known as the Antardhāna.
Antardhāna means that these living creatures can be perceived to be present, but they cannot be seen by vision.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness