摩訶止觀 2.57

2.57

又觀四運與虛空等，即「常」；不受四運，即「樂」；不為四運起業，即「我」；四運不能染，即「淨」。是佛法四運。如是四運雖空，空中具見種種四運，乃至遍見恒沙佛法，成摩訶衍。是為假名四運。

Furthermore, contemplating that the four movements are equal to empty space is 'eternity'; not receiving the four movements is 'bliss'; not giving rise to karma on account of the four movements is 'self'; being unstained by the four movements is 'purity.' These are the four movements of the Buddha-Dharma. Although the four movements are thus empty, within emptiness one completely sees the various four movements, even ubiquitously seeing the Buddha-Dharmas numerous as the sands of the Ganges, accomplishing the Mahāyāna. These are the four movements of provisional designation.