Verse 9

दुःखमूलमवष्टब्धमस्मिन्नेव विनिश्चलम् ।विद्यमानं मनो विद्धि दुःखवृक्षवनाङ्कुरम्

In plain words

Know the existing mind to be the root of sorrow, lodged fast and unmoving right here -- the sprout of the forest of sorrow's trees.