Verse 55

तदनु विषयवासनाविनाश-स्तदनु शुभः परमः स्फुटप्रकाशः ।तदनु च समतावशात्स्वरूपेपरिणमनं महतामचिन्त्यरूपम्

In plain words

After that follows the destruction of vāsanā for sense-objects; after that, the supreme, auspicious, clear radiance; and after that, through the power of samatā, the great ones' transformation into their own true nature — a thing whose very form is beyond thought.