Ultimately, the reason why love and compassion bring the greatest happiness is simply that our nature cherishes them above all else. The need for love lies at the very foundation of human existence.
When faith is completely replaced by creed, worship by discipline, love by habit; when the crisis of today is ignored because of the splendors of the past; when faith becomes an heirloom rather than a living fountain; when religion speaks only in the name of authority rather than with the voice of compassion, its message becomes meaningless.
What acts as a far more effective circumstance for generating compassion and what, in fact, rouses us from our comfortable meditation seat is actually seeing or hearing others - encountering others directly, not just conceptually in our imagination.
It is not enough simply to wish that love and compassion should increase in us. We need to make a sustained effort, again and again, to cultivate the positive aspects within us - and the key here is constant familiarity. The nature of human thoughts and emotions is such that the more you engage in them, the more you consciously develop them, the more powerful they become.
We are beset by problems and if we look for their source, we find they arise because of our selfishness, because we tend to pursue our own interests at the expense of others. Our various religious traditions exist to help us reduce these problems. They all teach ways to overcome suffering through cultivating love and compassion, tolerance, patience and contentment.
And could I look upon her without compassion, seeing her punishment in the ruin she was, in her profound unfitness for this earth on which she was placed, in the vanity of sorrow which had become a master mania, like the vanity of penitence, the vanity of remorse, the vanity of unworthiness, and other monstrous vanities that have been curses in this world?
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.