Mahabharata 14.21.13

यस्मादसि च मा वोचः स्वयमभ्येत्य शोभनेतस्मादुच्छ्वासमासाद्य न वक्ष्यसि सरस्वति

yasmādasi ca mā vocaḥ svayamabhyetya śobhanetasmāducchvāsamāsādya na vakṣyasi sarasvati

Our plain-language meaning of this verse is waiting for scholar review.