Ramakrishna Charitam. Vol III Book VII Chp 18 Shlokas 22 - 23
श्रीदेव्युवाच
जानीहि कृष्णमेव त्वं पूर्णं ब्रह्म सनातनम् |
यं विचिन्वन्ति योगीन्द्रा बहुधा योगसाधनैः ||
यन्माहात्म्यं न जानन्ति मुनयक्ष्च तपोधनाः |
तमेव परमात्मानं भज बृन्दावनस्थितम् ||
Shri Devi said
The Supreme Being sought for by all the great yogis through various yogic feats, is Lord Krishna Himself. He is the Supreme Brahman! That Supreme Soul, whose glory is not fully realized even by the seers, who are great repositories of penance, is only Lord Krishna playing in Shri Brindavan. You must know this truth.