Ramakrishna Paramahamsa on how he experienced mother goddess

When I jumped up like a madman…, suddenly the blessed Mother revealed herself. The buildings with their different parts, the temple, and everything vanished from my sight, leaving no trace whatsoever, and in their stead I saw a limitless, infinite, effulgent Ocean of Consciousness. As far as the eye could see, the shining billows were madly rushing at me from all sides with a terrific noise, to swallow me up. I was caught in the rush and collapsed, unconscious… within me there was a steady flow of undiluted bliss, altogether new, and I felt the presence of the Divine Mother.

Ramakrishna Paramahamsa

(Source: Ramakrsna Kathamrta translated by Swami Nikhilananda as The Gospel of Sri Ramakrishna.)