If we need to live well, we almost do not have an option but to pay attention to our life as it is unfolding moment to moment. Mindfulness is about wisely paying attention to what is occurring within and outside us without judging it. It helps us because most of our suffering comes from our mind. It comes from judgments about how life is not good enough or how it should be bettered. It comes from continuously interpreting rather than experiencing it and from our lack of clarity about the nature of reality.
As Henepole Gunaratna says
So why bother? Why waste all that time and energy (meditating), when you could be out enjoying yourself? Why bother? Simple. Because you are human. And just because of the simple fact that you are human, you find yourself heir to an inherent unsatisfactoriness in life which simply will not go away. You can suppress it from your awareness for a time. You can distract yourself for hours on end, but it always comes back–usually when you least expect it. All of a sudden, seemingly out of the blue, you sit up, take stock, and realize your actual situation in life.
As you practice mindfulness, you can slowly begin to have a better connection with your life. As that connection increases, you start slowly teasing apart what is actually happening from the mind’s commentary of what is happening. You can see the present moment for what it is- brief, fleeting, ever changing.