Based on the content of the excerpt, students choose the appropriate lessons. Here are suggestions: The lesson of life that the text wants to convey through the journey from the river to sea of water: - Every person's life is finite, live meaningfully. To be like that flow, when we are born, we are just tiny drops of water that rise from "crevices in the ground" but at the end of our lives, we have grown into a vast land, contributing to "making great agricultural regions". - Life contains many trials and difficulties, be strong as the flow to be able to "penetrate the mountain" or even "form a canyon", knocking back the difficulties of life. - Life has so many different colors and levels, let's slow down a little to listen and enjoy the beauty of life, thereby adding richness to our souls.