Developing compassion requires us to learn to face pain rather than run from it. Gratitude practice helps us to see that we are connected to every thing- Good and bad. In the end we're grateful even for our pain, which turns out to be the gateway to a deeper love.
Suffering is pervasive-there's no escape. But we all suffer together in exactly the same way, so we are close to one another. Bodhisattvas know this means love and compassion are the most real emotions in our lives.