Never leave a friend behind. Friends are all we have to get us through this life--and they are the only things from this world that we could hope to see in the next.

This quote means that it is important to always be there for your friends and to never abandon them. A person’s friends are the most important thing in their life and the only thing that will last beyond this world. In other words, even when things are tough, it’s important to stay loyal to your friends and for them to stay loyal to you.