Don’t be afraid to suffer—take your heaviness and give it back to the earth’s own weight; the mountains are heavy, the oceans are heavy.
— Rainer Maria Rilke, Sonnets to Orpheus
What causes reflection to constantly deepen your life? It is truth, the original nature of existence, which is called dharma. Dharma creates reflection, and reflection creates suffering and pain. But that suffering give you many chances to investigate the root of your life and deepen your life in the dharma. That's why the Buddha said that suffering is truth.