This is the simple response:

In my view, the first 2 minutes of the video gave a brief introductory definition, namely, that the citta is:

• the mind's essential knowing nature
• that it is pure and simple awareness
• that the true citta only knows, and exhibits no activities or any conditions

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The detailed explanation is given in order to stick firmly to Ajahn Maha Boowa's teaching and not distort it.