This saying, "Don't be a source of hurt to others", has always been on my mind since I heard this from a priest who made his homily in a TV Mass during Christmas' Eve. He also repeated this phrase during the Easter Sunday Mass. This saying is a simple phrase, yet, has a big impact for me. It always makes me realize that we shouldn't be a source of hurt to others but, instead, love one another and never ever hurt other people's feelings.
And, in connection with this, the phrase also reminded me of another saying from Dalai Lama:
"Our prime purpose in this life is to help others. And if you can't help them, at least don't hurt them."