Our practice is to be aware of pleasant feelings without desperately trying to make them last when they go away. Our practice is also to be aware of unpleasant feelings without struggling to get rid of them when they come. We can also learn to be aware of neutral feelings without being bored or restless.
Feeling-tone can also be neither pleasant nor unpleasant but somewhere in-between ("neutral").
Letting feelings come and go by themselves and simply staying aware of them without getting caught up in them, we weaken the forces of greed, hatred, and delusion that are the causes of all suffering.
Our practice then leads directly to an abiding happiness and peace.