This powerful teaching form the Upanisa Sutta shows us how suffering when understood with wisdom leads to faith and is the beginning of a natural unfolding of beautiful qualities of the heart which provide the foundation for the mind to turn to awakening.
The only thing that we can know for sure is the constancy of chance. It's the most basic fact of our existence. Realization of the truth of impermanence is a gateway out of feeling the separateness - the suffering of self-centered existence. We begin to understand that we are intimately woven into endlessly changing, reflective web of life.