Zongmi 10.2:
Tsung-mi says, “What adorns? The ten thousand practices of the Six Paramitas, charity, precepts, meditation, and wisdom—all good dharmas adorn.”
Zongmi 10.22:
Tsung-mi says: “How do we purify the mind? Externally, we remain uncontaminated by the six sensations, internally we remain free of self and being as well as unattached to nirvana. This is called purification.”