I apply that saying to the way I view friendship. We all agree that friendship is a two-way street. Just like no one chooses to go to hell, a friend never wants to be disappointed by another. Yet in the real world, where there is expectation, there will be disappointment. Such is the law of yin and yang.
Knowing such reality, it reinforces my person philosophy about friendship. I will strive to be the best friend to another as I can without expectation. That way I don't have to be disappointed (not that feeling disappointed is always a bad thing. How else are we going to grow?). When a friend reciprocates, that is a bonus. It is that simple.
If I don't like to suffer, why would I want my freind to suffer? Therefore, if I don't suffer, who suffers?