It is the enemy who can truly teach us to practice the virtues of compassion and tolerance.
The Dalai Lama's words have been rephrased and memed as in the graphics below, and I made one here with the quote itself:
Buddha image by Angela Marie Henriette
Here are the graphics which inspired me to make my own; they come from 20 Quotes That Can Change Your Thinking And Perception.
In the practice of tolerance,
one's enemy is the best teacher.