when You realize that happiness is something important, then you have to develop important qualities of mind

You realize that happiness is something important, and if it really is important, then you have to develop important qualities of mind.

As we do this, we find that our actions become less and less harmful; there is less and less cause for conflict. On the one hand, that makes it easier for us to practice. On the other hand, it makes the world a better place to be in general — and in particular, in terms of our thoughts, the world of our own mind becomes better, too, because, of course, our actions and words come out of our thoughts. This is where the Buddha finds the source of conflict to begin with." ~ Thanissaro Bhikkhu "No Happiness Other than Peace"