If you think that you can’t do it, you are selfish. Simply because you are thinking about yourself. If you think you can, you’re still the same. Same reason.
When you are about to do something, believe that you can. Don’t think long. And yes, there’s a difference. But of course, considering the fact that that something is for the good––morally good in the basis of your good-natured conscience.
Now, that’s faith.
You know that you are being selfish when the result of your labor is not centered in your glory. Instead, all are channeled to build others up for society’s progress.
When you do that, reaping the good harvest will just be immeasurable. You’ll completely understand what it is to be happy and contented, all at the same time.