Buddha-mind

Buddha-mind refers to bodhicitta, " Buddha's compassionate and enlightened mind," and/or to Buddha-nature, "the originally clear and pure mind inherent in all beings to which they must awaken."

Explanation

Regarding awakening, Harold Stewart explains:
Busshin may also refer to Buddhakaya, the Buddha-body, "an embodiment of awakened activity."
Chan/Zen is also called foxin zong or busshin-shū, the "Buddha-mind school."