A Quote from St. Catherine of Siena

I would have you know that every good, whether perfect or imperfect, is acquired and made manifest in me. And it is acquired and made manifest by means of your neighbor. Even simple folk know this, for they often love others with a spiritual love. If you have received my love sincerely without self-interest, you will drink your neighbor’s love sincerely. It is just like a vessel that you fill at the fountain. If you take it out of the fountain to drink, the vessel is soon empty. But if you hold your vessel in the fountain while you drink, it will not get empty: Indeed, it will always be full. So the love of your neighbor, whether spiritual or temporal, is meant to be drunk in me, without any self-interest.  

St. Catherine of Siena (The Dialogue)