Nothing is lost in the Universe
As we know, a dead leaf turns into soil, a seed sprouts and becomes a new plant; old solar systems disintegrate and turn into cosmic rays. And as we are born of our parents, our children are born of us.
We are the same as plants, as trees, as other people, as the rain that falls. We consist of that which is around us, we are the same as everything. If we destroy something around us, we destroy ourselves. If we cheat another, we cheat ourselves.
Everything changes
Everything is continuously changing. As life is like a river that flows on and on, ever-changing. It may flow slowly sometimes, and otherwise swiftly. Smooth and gentle is at places, but later on snags and rocks crop up out of nowhere.
As once dinosaurs, mammoths and saber-toothed tigers roamed this Earth, they all died out, yet, this was not the end of life. Other forms like smaller mammals appeared, and eventually humans, too. Now we can even see the Earth from space and understand the changes that have taken place on this planet. Our ideas about life also change.
People once believed that the world was flat, but now we know that it is round.
The law of Cause and Effect
This is very much known as karma. Nothing ever happens to us unless we deserve it. We receive exactly what we earn, whether is good or bad. We are the way we are now due to the things we have done in the past. Our thoughts and actions determine the kind of life we can have. If we do good, in the future good things will happen to us. If we harm or do bad things, then in the end bad things will happen to us.
Every moment we create karma by what we say, do and think. If we understand this, we don't need to fear karma, as it becomes our friend. It teaches us to create a brighter future.