摩訶止觀 9.61

9.61

薩埵亡身、鹿杖所害者，皆得斯觀。內不計我，外不愛所，低頭慚愧，厭心相續（云云）。《大經》云：「除却皮肉諦觀白骨，一一節間皆今繫念，逆順觀察令骨淨潔。」是名「內有色相」。外觀色者，外見死屍膖脹膿壞，滿一聚落、一國土。如前九想所觀不淨，故言「外觀色」。位在欲界定。此法增進，見骨起四色——青、黃、白、鴿，煜煜爚爚，將發不發。青色青光乃至鴿色鴿光，狀如流水，光籠骨人如塵霧鏡日。若心緣足，光隨向下；若心緣頭，光隨向上。以青光力，映蔽十方悉見青色，如須彌山隨方色一；乃至鴿色亦如是。若此光色將發不發，位在未到地定。

The Bodhisattva offering his body [to the tigress] or those killed by the deer-stick ascetic all attained this contemplation. Internally they did not reckon a self; externally they did not cherish possessions; bowing their heads in shame, their minds of aversion continued without interruption (and so forth). The Mahāparinirvāṇa-sūtra states: "Removing the skin and flesh, clearly contemplate the white bones; between each and every joint, let mindfulness be bound, observing forward and backward to make the bones pure and clean." This is named "the mark of having internal form." "Observing external form" means externally seeing corpses bloated, purulent, and decaying, filling an entire village or an entire country. Because it is the impurity contemplated in the preceding nine thoughts, it is said to "observe external form." Its rank is in the concentration of the desire realm. As this practice progresses, one sees the bones give rise to four colors—blue, yellow, white, and dove-gray—flashing and glimmering, on the verge of manifesting yet not fully manifested. The blue color with blue light, and so on up to the dove-gray color with dove-gray light, are like flowing water; the light envelops the skeleton like dust and mist around the sun in a mirror. If the mind focuses on the feet, the light moves downward accordingly; if the mind focuses on the head, the light moves upward accordingly. By the power of the blue light, it outshines the ten directions so that all are seen as blue, just as Mount Sumeru colors each direction uniformly; and so on up to the dove-gray color, which is also like this. When this light and color are on the verge of manifesting yet not fully manifested, the rank is in the concentration of the threshold stage.