The manas has existed in the desire realm for countless kalpas and is already extremely familiar with material form (rūpa) of the desire realm, such as sunlight. The Buddha-dharma, however, is relatively unfamiliar to the manas. The manas of wisdom is already very familiar with sunlight, having been in contact with it for countless kalpas, whereas the Buddha-dharma is relatively novel and unfamiliar to the manas; its wisdom and experience are insufficient, so it cannot make correct, reasonable, and rapid judgments. Therefore, it is not easy for the manas to accept the Buddha-dharma, nor to understand it, still less to cultivate itself in accordance with the Buddha-dharma, and it is extremely difficult for it to correct itself according to the Buddha-dharma. For this reason, it is necessary to let the mind consciousness frequently come into contact with the Buddha-dharma and understand it correctly and reasonably, thereby immersing and permeating the manas, making the manas familiar with the Buddha-dharma, interested in it, willing to cultivate and study it, and willing to correct itself in accordance with it. When the manas turns the unfamiliar into the familiar with regard to the Buddha-dharma, and turns the familiar into the unfamiliar with regard to worldly dharmas, progress in cultivation and advancement on the path will be very swift.
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