The Wind
Akira the monk approached the Zen master and said, "Master, what is nothingness?"
Abrupty, the Zen master poked Akira in the chest with his right index finger.
Akira stepped back in shock, looked down at the master's finger and his own chest, and at once saw his true nature like a thunderclap that exploded in his diaphragm. A simultaneous flash of lightning instantly spread to the tips of his toes, fingers, and head. Akira looked up, wild eyed, nearly breathless, and said,
"Yes, master, I understand! The truth is in the Buddha Heart! I myself am nothingness because there is no self, just so many aggregates. In fact the whole universe is illusion, empty of intrinsic existence, a construct under which lies nothingness. Clinging to beliefs in either self or universe will only lead to dejection and more suffering, while rejecting them will lead to peace and wisdom. Is that it, master? Is it?!"
The master replied, "No. Pull my finger."