God may hide Himself by His yogamāyā, as it is stated in the Bhagavad-gītā: nāhaṁ prakāśaḥ sarvasya yogamāyā-samāvṛtaḥ (BG 7.25). Yogamāyā-samāvṛtaḥ. Just like the sun is covered by the glaring disk. You will find if you look into the sun disk, you will find a one circle is moving like that. Similarly, in the Upaniṣad also, we find that the Supreme Lord is hidden within the brahma-jyotir. The exact verse, I forget just now. It is stated that, "Please remove this cover so that I can see You actually." So within the brahma-jyotir, there is the Supreme Personality of Godhead. So ordinarily people are amazed with simply brahma-jyotir, they do not go deep into the matter. So, ullaṅhita-trividha-sīma-samātīśāyi (CC Antya 3.92). God is beyond the limitation of our thinking and philosophical speculation. Sambhāvanaṁ tava parivraḍhima-svabhāvam: "Your very grave and confidential activities, it is very difficult to understand by ordinary men." Māyā-balena bhavatāpi niguhyamānam. Māyā-balena: "That yogamāyā, although it is covered in that way all Your activities," paśyanti, "Somebody can see You." Paśyanty kecid aniśam: "Not sometimes or accidentally, but aniśam, continually, he can see You." Paśyanti kecid aniśam tvad-ananya-bhāvāḥ. Ananya-bhāvāḥ means "Those who have unflinching devotion unto You." They can see. Premāñjana-cchurita-bhakti-vilocanena (BS 5.38). Although God is covered in that way.
There is very good instance in the Śrīmad-Bhāgavatam. While Kṛṣṇa was dancing with the vraja-gopīs, He all of a sudden disappeared and all the gopīs, they became mad after Him and began to search in the forest, "Where is Kṛṣṇa?" So Kṛṣṇa, at one place, He situated Himself as Viṣṇu, as Viṣṇu, with four hands. Then gopīs, in their search after Kṛṣṇa, they saw, "Here is Viṣṇu sitting." So they did not care., "Oh, He is Viṣṇu. We don't want." Now see.