Verse 20

नास्त्येषा परमार्थे न त्वेवं भावनयेद्धया ।ज्ञो भूत्वा ज्ञेयसंप्राप्तो ज्ञास्यस्यस्यास्त्वमाशयम्

In plain words

This does not exist in ultimate reality; but not thus, through a kindled bhāvanā, [is it known] — having become the knower and having attained what is to be known, you yourself shall know its very ground.