Dogen on Bodhicitta (the mind, or thought of enlightenment).

In general there are three kinds of mind. “The first, citta, is here called thinking mind. The second, hrdaya, is here called the mind of grass and trees. The third, vrddha, is here called experienced and concentrated mind.” Among these, the bodhi-mind is inevitably established relying upon thinking mind. Bodhi is the sound of an Indian word; here it is called “the truth.” Citta is the sound of an Indian word; here it is called “thinking mind.” Without this thinking mind it is impossible to establish the bodhi-mind. That is not to say that this thinking mind is the bodhi-mind itself, but we establish the bodhi-mind with this thinking mind. To establish the bodhi-mind means to vow that, and to endeavor so that, “Before I myself cross over, I will take

across all living beings.” Even if their form is humble, those who establish this mind are already the guiding teachers of all living beings. This mind is not innate and it does not now suddenly arise; it is neither one nor many; it is not natural and it is not formed; it does not abide in our body, and our body does not abide in the mind. This mind does not pervade the Dharma world; it is neither of the past nor of the future; it is neither present nor absent; it is not of a subjective nature, it is not of an objective nature, it is not of a combined nature, and it is not of a causeless nature. Nevertheless, at a place where there is mystical communication of the truth, establishment of the bodhimind occurs. It is not conferred upon us by the buddhas and bodhisattvas, and it is beyond our own ability. Establishment of the mind occurs during mystical communication of the truth, and so it is not inherent. Shobogenzo, Hotsu Bodaishin, Gudo Nishijima & Mike (Chodo) Cross