Everything changes all the time.

If our minds understand the truth here, our minds will gradually detach from the world, just like our bodies change every day. Our minds change all the time. Observe, and the external world is the same; it changes all the time. Soon, a year or another year passes, and the external world changes, our bodies change, and our minds fluctuate from happiness to suffering, back and forth. If someone accumulates good karma, their minds become calm, stable, and stronger as a year goes by. If they follow sensual desires, their minds become more troubled. Nothing remains the same, neither evil nor good.

Learn to see the truth. We don't aim for what's good, happy, or peaceful because goodness, happiness, and peace are not constant. We perform good deeds to allow our minds to see the truth. The truth of the body is not constant; it's suffering and impermanent. The truth of the mind is also not constant; it's suffering and impermanent. Even the external world is not constant; it's suffering and impermanent. Feed your mind with good data, such as the data consisting of the three characteristics. Feed it to learn. Once it knows the truth, it will let go by itself. The world is nothing but suffering.