CC Madhya 8.265
bāhire nā kahe, vastu prakāśe hṛdaye
Rāmānanda Rāya continued, “The Supersoul within everyone’s heart speaks not externally but from within. He instructs the devotees in all respects, and that is His way of instruction.”
Here Śrī Rāmānanda Rāya admits that Śrī Caitanya Mahāprabhu is the Supersoul. It is the Supersoul that inspires the devotee; therefore He is the original source of the Gāyatrī mantra, which states, oṁ bhūr bhuvaḥ svaḥ tat savitur vareṇyaṁ bhargo devasya dhīmahi dhiyo yo naḥ pracodayāt. Savitā is the original source of all intelligence. That Savitā is Lord Caitanya Mahāprabhu. This is confirmed in Śrīmad-Bhāgavatam (2.4.22):
vitanvatājasya satīṁ smṛtiṁ hṛdi
sva-lakṣaṇā prādurabhūt kilāsyataḥ
sa me ṛṣīṇām ṛṣabhaḥ prasīdatām
“May the Lord, who in the beginning of the creation amplified the potent knowledge of Brahmā from within his heart and inspired him with full knowledge of creation and His own self, and who appeared to be generated from the mouth of Brahmā, be pleased with me.” This was spoken by Śukadeva Gosvāmī when he invoked the blessing of the Supreme Personality of Godhead before delivering Śrīmad-Bhāgavatam to Mahārāja Parīkṣit.