Open your heart to that human being and if you feel even a little that you’d want their suffering to end, reflect on that feeling.

Once you can empathize with another person, and understand his humanity and suffering, the next step is to want that person to be free from suffering. This is the heart of compassion — actually the definition of it. Try this exercise: Imagine the suffering of a human being you’ve met recently. Now imagine that you are the one going through that suffering. Reflect on how much you would like that suffering to end. Reflect on how happy you would be if another human being desired your suffering to end, and acted upon it. Open your heart to that human being and if you feel even a little that you’d want their suffering to end, reflect on that feeling. That’s the feeling that you want to develop. With constant practice, that feeling can be grown and nurtured.