When you serve others - whether purposefully, through volunteering or fundraising - or spontaneously, through random acts of generosity - you are indulging in what is quite possibly the best kind of selfishness around.
When you serve, you'll receive...
... inspiration. You'll see the human spirit as it ought to be.
... gratitude. You'll have a fresh view of the goodness that is in your own life.
... purpose. You'll feel connected to a larger story.
You may only be impacting a small corner of the world, but it's your corner and you'll leave it slightly better than when you arrived.
Now multiply that small corner by 7 billion.