Seek two Zen stories or cases and their purpose

Master Shen Guang (Master Hui Ke, the second ancestor) was troubled by nightmares. The first time I met Master Dharma, he asked the Master to feel at ease. Master Dharma said: Good! You bring the heart and I'll fix it for you! Master Shen Guang searched inside and outside his body, but he couldn't find this uneasy heart, so he said to Master Dharma: I found my heart, it's not inside, it's not outside, it's not in the middle, I can't find it. Master Dharma said: I have set my heart for you! Master Shen Guang had an epiphany. Aware of what? It is futile to realize that this heart we have. Because color, acceptance, thinking, behavior and knowledge are my heart, if I see through the falsehood, I will have no anxiety.

The old monk is an enlightened man. As soon as everyone talked about Buddhism, he stretched out a finger. Everyone praised the old monk for his profound meditation and lofty deeds. Once, the old monk was traveling, the young monk was at home, and everyone came to seek the Dharma. The young monk doesn't understand the Buddha's heart and Zen, and he also imitates the old monk and stretches out a finger. Everyone praised the young monk as a powerful and enlightened person. When the old monk came back and heard about it, he called the young monk to his side and asked him, what is Buddhism? The young monk stretched out a finger hesitantly. Just then, the old monk pulled out a knife and cut it down. The young monk gave a groan of pain and ran out. The old monk shouted: What is Buddhism? The young monk suddenly realized. Aware of what? Knowing Buddhism is all about one heart, but even one heart can't stand it.