What Brahman is cannot be ...

What Brahman is cannot be described. All things in the world — the Vedas, the Puranas, the Tantras, the six systems of philosophy — have been defiled, like food that has been touched by the tongue, for they have been read or uttered by the tongue. Only one thing has not been defiled in this way, and that is Brahman. No one has ever been able to say what Brahman is.
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 Ramakrishna

Quotes from the same author

If you want to go east, don't go west.
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 Ramakrishna
God reveals Himself to a devotee who feels drawn to Him by the combined force of these three attractions: the attraction of worldly possessions for the worldly man, the child's attraction for its mother, and the husband's attraction for the chaste wife. If one feels drawn to Him by the combined force of these three attractions, then through it one can attain Him.
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 Ramakrishna
Little children play with dolls in the outer room just as they like, without any care of fear or restraint; but as soon as their mother comes in, they throw aside their dolls and run to her crying, "Mamma, mamma." You too, are now playing in this material world, infatuated with the dolls of wealth, honour, fame, etc., If however, you once see your Divine Mother, you will not afterwards find pleasure in all these. Throwing them all aside, you will run to her.
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 Ramakrishna
As for myself, I look upon all women as my Mother. This is a very pure attitude of mind. There is no risk or danger in it. To look upon a woman as one's sister is also not bad. But the other attitudes are very difficult and dangerous. It is almost impossible to keep to the purity of the ideal.
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 Ramakrishna
God laughs on two occasions. He laughs when the physician says to the patient's mother, 'Don't be afraid, mother; I shall certainly cure your boy.' God laughs, saying to Himself, 'I am going to take his life, and this man says he will save it!' The physician thinks he is the master, forgetting that God is the Master. God laughs again when two brothers divide their land with a string, saying to each other, 'This side is mine and that side is yours.' He laughs and says to Himself, 'The whole universe belongs to Me, but they say they own this portion or that portion.'
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 Ramakrishna