As the Buddha said, impermanence is the nature of the human condition. This is a truth we know in our minds but tend to resist in our hearts. Change happens all around us, all the time, yet we long for the predictable, the consistent. We want the reassurance that comes from things remaining the same. Yoga philosophy offers an alternative to these tendencies. It is to embrace the powerful truth: the power of living in the unchanging, eternal present.
We can even look to our yoga mat to watch the attachment pattern play itself out. We often find ourselves attached to a never-ending process of "improvement" in our asanas. They do improve quickly at first—in the beginning, we are on a honeymoon of discovery; we grow by leaps and bounds in ability and understanding. After a couple of decades, however, our poses change much less. Oftentimes, we can no longer practice certain poses because of age or injury, yet we feel agitated because we assume that the poses of our youth should be the poses of our middle and old age.
What gives life its juice is the ability to mourn anything fully and simultaneously know it doesn't ultimately matter. In other words, we can live to the fullest when we recognize that our suffering is based not on the fact of impermanence but rather on our reaction to that impermanence.