When we spend our time thinking about the future and what might happen or the past and what has happened, we fail to be present in the moment. When we live this way we miss a lot of beautiful moments through focusing on our own anxieties and dreams.
It is good to have concern over certain things in life and to have aspirations, but much of our concerns will never come true and we will not reach our aspirations if we do nothing in the present to achieve them.
We also miss an opportunity to fully experience and understand the things that happen in our lives. In order to do this we need to be more present, to be mindful of what is happening moment to moment. As a great Buddhist once said, when you sit, sit, when you stand, stand, when you walk, walk. In other words, fully do the thing you are doing. Get out of your head and into the moment.
The Fullfilment Project 