This Buddha quote works well if you have a strong will. The pain will come no matter what, but at least you will have the option to decide to suffer or not.
Of course, physical pain will make it harder to stop suffering but at least you can do something about it.
Emotional pain, if you are trained well enough, can have no suffering at all. Think about it. If you went through some pain in your life you carried around with you for a while, maybe even years. But the moment the suffering stopped you felt better about yourself or you made a decision for yourself and you were able to get rid of suffering in a moment. You can choose to end suffering the moment the pain shows up if you want.