I don't think that happiness is more important or "better" than bad feelings, therefore. One is the natural instinctual process of the other, the result of which the individual soul will always arrive at a greater awareness of his or her own eternal nature, much as the dawn is already in the womb of dusk, as another spiritual teacher has suggested.
The sun kisses every day with infinite love and peace, and so may we in our own unique ways, without even thinking about it. When we can feel the possibility of peace within ourselves, then can we conceive of peace within the world, a peace which is as good as already here, as good as ourselves, for it is all that ever was. In this is the deep value and radiance of every single human soul reflecting down from that same sun, this same moment of all the people of the Earth.
When I write poetry, I feel really good about any kind of relationship that is suggested between the body or mind's motion through physical space (as in the act of reading) and the experience by the soul of its own eternal nature.