For an act to be moral the intention must be based on compassion, not duty. We do something because we want to do it, because we feel we have to do it, not because we ought to do it. And even if our efforts fail - or we never even get to implement them - we are still moral because our motivation was based on compassion.
Those who don't have a life filled with luxury may have a home filled with compassion, based on their choice to be content and to practice self-discipline. Even when we have physical hardships, we can be very happy.
When something needs to be done in the world to rectify the wrongs, if one is really concerned with benefiting others, one needs to be engaged, involved. This is action out of compassion.
If once we admit, be it for a single hour or in a single instance, that there can be anything more important than compassion for a fellow human being, then there is no crime against man that we cannot commit with an easy conscience.
If indeed the qualities such as love, patience, tolerance, and forgiveness are what happiness consists in, and if it is also true that compassion, defined as concern for others, is both the source and the fruit of these qualities, then the more we are compassionate, the more we provide for our own happiness.
If you are angry you will share anger, if you are greedy you will share greed, if you are full of lust you will share your lust. We can share only that which we have, we cannot share that which we don't have. This has to be the fundamental thing to be remembered; hence the first step is meditation and the second step is compassion.