Growing up

When you're a child, you think that everything comes from a tree.

Then when you grow, you learn that you're the one who must sow that tree. Later, you know that tree grows from a seed. When you grow up a little more, you realize that the tree grows differently depending the season in which you've sowed it. Time after, you learn that not every soil is optimum for every tree.

And when you became old, you know that not everything comes from a tree. And you've wasted your time sowing.