I have found the paradox, that if you love until it hurts, there can be no more hurt, only more love. -Mother Teresa
Love is not a fairy-tale. It involves patience, getting hurt, suffering and pain. This could be with a child, a loved one, or a friend. This quote by Mother Teresa is saying that if you can love someone throughout a tough journey, true love is revealed because it is only proven during difficulties.
This quote by Mother Teresa is referring to her dedication and love for God and his people. She was very passionate about this and lived a sacrificial life towards helping others. All the problems and hurt from this world no longer influenced her because her love was great and intense that it removed all selfishness found within her.