Verse 18

निश्चयेषु चतुर्ष्वेषु बन्धाय प्रथमः स्मृतः ।त्रयो मोक्षाय कथिताः शुद्धभावनयोत्थिताः

In plain words

Of these four niścayas, the first is known to bind; the three that follow, risen from a pure bhāvanā, are declared to lead to mokṣa.