That's a good quote.
I was at school.
I often join the activities of nature lovers.
My teacher always tells us.
"Take only memories, leave only footprints."

When doing adventure in the wild. My teacher is always teaching.
Three things.

1. Do not take anything. except the picture only

nature provides a variety of flora, animals, even rocks that captivate the heart to be souvenirs. But acts such as picking flowers or catching animals, will only damage nature. If you want to bring a souvenir just by painting or photographing it.

2). Leave anything but foot prints.

When adventuring, all previous activities, especially the waste generated are never abandoned, bring it home again. Because these objects are mainly plastic waste will have a great adverse impact on environmental sustainability. Including leaving no marks in the form of graffiti, strokes, and the like on trees and stones.

3).kill nothing but time.

Sufficient time alone was killed during the adventure.

when I see people ruin. surely I will admonish them.
let the beauty of nature remain preserved