Lao Tzu became enlightened through seeing a dead leaf falling from a tree. He was sitting under a tree meditating for years, and nothing was happening -- and he had been to great Masters. Something was missing. He was trying too hard to grasp the truth; that very effort was the barrier. That early spring morning, the birds singing, the trees swaying, the sun shining, the fragrance of the flowers... he forgot all about enlightenment.