Other than the metabolic functions, the only other ever changing, living being inside us is our thoughts. Life is a manifestation of our thoughts. Thoughts change every moment. From one thought to another. Just the way the time goes, from one to another. We have no control on the moment we live. How many, no one knows. Similar, we have no control on the thought that comes in our mind. We can only live and experience one moment a time. Similarly, there can be only one thought at a time in our life. At this moment I am thinking of food. Or at this moment I am planning my next act. Or I am very happy at this moment......Cherish the moment for it only goes never to come back again. Cherish the thought, for it is fleeting. Won't come back again.Live the moment. Live the thought.