A group of people were travelling in a boat. One of them took a drill and began to drill a hole beneath himself.

His companions said to him: “Why are you doing this?” Replied the man: “What concern is it of yours? Am I not drilling under my own place?”

Said them to him: “But you will flood the boat for us all!”

Moral of the story: Our life is not just for our own. Every action and decision made affect one another.

Reference:

From the teaching of Rabbi Shimon Bar Yochai