Mind and nature are fundamentally identical, but from the standpoint of the relative aspects of truth and falsehood, motion and stillness, delusion and enlightenment, they are apparently different from each other. The word “Nature” implies Fundamental Nature, also called “Void-Nature”, “self-Nature”, “True Mind” (prior to thought-arising.True mind is Self-Nature and in this sense, the two terms can be used interchangeably),
“Bhutatathata”, “Reality”, “Fundamental Face”, ect.. Mind is thought,which may be called deluded mind or illusory mind, and includes feeling, impression, conception, consciousness and so forth.
To use a metaphor, nature is to mind as water is to wave. Referring to their substance, water, and wave maybe said to be identical with each other, because of their common characteristic of wetness; as to their respective phenomenon and functioning, whereas the phenomenon of water is stillness and that of wave motion, whereas the reflection of moonlight is helped by the stillness of water but is hindered by the motion of the wave.
Water and wave may be said to be different from each other. In reality, mind and nature are neither identical, nor different from each other. Comparatively speaking, it is easier to know one’s own mind, which like the wave, is always agitated and restless; owing to the non-subsidence of the mind. However, it is impossible to see the nature of mind, same as the phenomenon of stillness of water can never be seen as long as the turbulent waves are in action, and so we do not think there is such a thing as the nature of mind. To refute this fallacy, let us ask. ” Is there water or not when waves are at a complete standstill?”