Heart Sutra
Therefore, when you are lost, you are a teacher, and when you are enlightened, you are self-conscious. When you are lost, good knowledge will come to you and gain insight into your own nature, and you will be able to "change your past mistakes and study the Fa tirelessly." So after the king of dissent learned, he became enlightened, and after he became enlightened, he repented of his past slander of the Three Jewels. Therefore, His Holiness was asked to receive daily counseling from his king and to teach him the essentials of the Dharma. "Forget day and night", he has morning and evening classes, and he can talk about forgetting to sleep and eating, never getting tired, and will not get tired until he is 90 years old.
"He said, 'The king is not seen in this present and now.'" O king, your retribution and your Buddha-nature show its effect, but you can't see your Buddha-nature yourself. You're lost, so you don't see your own Buddha nature, you see it when you realize it, of course you can't see it when you get lost, and when you realize it, you see the wonderful use of that Buddha nature. That's why Buddhism is called wonderful wisdom, and if you get lost, you become knowledge, and the Dharma you know becomes common knowledge of Buddhism, just knowledge. But when you get enlightened, this becomes the wisdom of the Dharma.
Huang Bailin: Wenchang Emperor Jun Yin Qi Wen Guangyi Excerpt 08 Episode