Īśāvāsyopaniṣat 04
अनेजदेकं मनसो जवीयो नैनद्देवा आप्नुवन् पूर्वमर्षत्। तद्धावतोऽन्यानत्येति तिष्ठत्तस्मिन्नपो मातरिश्वा दधाति ॥४॥
anejadekaṁ manaso javīyo nainaddevā āpnuvan pūrvamarṣat। taddhāvato'nyānatyeti tiṣṭhattasminnapo mātariśvā dadhāti ॥4॥
Though Unmoved, That-One moves swifter than the mind. Even gods have not attained Him, without knowledge. Standing still, He runs and surpasses others. In Him, Wind god gives water offering.
Īśā.Bhāshya 04
In the Brahmananda Purana, there is a reference that elaborates on this verse, glorifying Lord Hari as 'tadevekam', i.e. That One . The root 'r̥ṣa' in the word 'arṣat' indicates knowledge.
"That-One alone is primarily superior, as He is without birth or fear. As it is impossible to comprehend Him properly, He is unattainable even by the gods.
Indeed, that supereme perceives all things by Himself, beforehand, by His inherent nature, by His inconceivable power and omnipresence.
Standing firm, He surpasses those that flow swiftly. In Him, the wind gods offer their deeds. Like wind gods, one should offer all the activities to lord Hari only."
- thus states BrahmandaPurana;
The root 'r̥ṣa' (in the word 'arṣat') indicates knowledge.