When about what is to be said, the speaker does not care for the understanding of the hearer by uttering words whose meaning is understood by himself, then, however good those words may be, they cannot be comprehended by the hearer.
वक्तव्ये तु यदा वक्ता श्रोतारमवमन्य वै। स्वार्थमाह परार्थं तत् तदा वाक्यं न रोहति॥