Many times we asked the same question on how we are imprisoned in samsara and how to free ourselves.
The answer is simple, it is mainly the ill effect of ignorance which gives rise to dualism and such belief has created everything! We then face never ending pain. In order to dismantle this structure of dualistic approach, the practice of emptiness is one of the most effective tools to eradicate emotions and whatever our mind may have constructed for many generations. For instance, when two sticks are rubbed together, it will create a fire and eventually both sticks and fire disappear. Similarly, when our ignorance constructs everything, emptiness practice is to dismantle it and it will give rise to the wisdom of the awakened ones. Eventually, dualism and thoughts of emptiness both dissolve to the universe like a stick and fire.