This is a Buddhist proverb. It means that the world is like a sea of suffering, boundless, and only enlightenment can be detached. It is also a metaphor that although the crime is heavy, as long as you repent, there is a way out.

Life is obsessed with all kinds of desires, and it does not hesitate to harm people's interests for one's own sake. If you can lose yourself, wake up and realize your mistakes, it is to go back and start again.

This is a metaphor. If you go further and further in the sea for your own selfish interests, you will never see the coast. Wake up to the shore. Only turning back is where you came from, that is, the shore. You can't just take it literally.