Even if our eyes can see, our ears can hear, there is nothing special about that since neither the eye nor the ear can apprehend the true nature of reality. Sound waves also change moment to moment. For instance, when we hear the two words “yan jing (eyes)” pronounced, we do not hear the arising and ceasing that take place within the sound, however hard we may try. We hear a continuous sound “yan_ _ _ jing_ _ _ ” but, in fact, what we hear is not one continuous sound, just instants of sound connected together.

Consider another example. If we light up a candle and make a circle in the dark with the candle, we will see a bright circle of fire. Actually, there is no circle to speak of. A circle does not exist at all. Because our eyes cannot capture each instant and step as the candle moves, we mistake all of these instants for one motion that is concurrent, continuous, and indivisible.

Similarly, when the two words “sheng yin (sound)” are pronounced, they too can be separated into many instants, each one thousandth of a second or one ten-thousandth of a second. These two words are not one continuous sound, but instants of sound that are pronounced in sequence. However, our ears are not able to make the distinction.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"