I know a Tibetan Buddhist reciting this mantra too. I'm curious.
To develop bodhichitta, which is the actual practice, you need to develop such compassion that you simply cannot bear others being tormented by suffering. But in order to develop this compassion, you must know exactly how you yourself are plagued by suffering. And you must understand that the whole of samsara is by nature suffering. But first you must fear the lower realms, for without this you will have no repudiation of celestial and human happiness. You must therefore train your mind in the small- and medium- scope parts of the path. -- Pabongka Rinpoche