摩訶止觀 7.171

7.171

又以增進心修行五悔，兼修六度；福德力故，倍助觀心更一重深進，名「第四品」也。文云：「況復有人能持是經，兼行六度，其德最勝，無量無邊，譬如虛空，至一切種智。」

Furthermore, with the mind of further progress, practicing the five repentances and concurrently cultivating the six pāramitās, by the power of merit and virtue, it doubly assists the mind of contemplation to advance one layer deeper, which is called the 'fourth rank.' The text says: 'How much more so for someone who can uphold this sutra and concurrently practice the six pāramitās; their virtue is most superior, immeasurable and boundless, like space, reaching all-knowledge (sarvākārajñatā).'