If we observe the present moment, thinking not of the past or the future, more often than not we will see that everything in the present is not so serious. Our thoughts can often be our worst enemy, causing needless suffering. People spend countless hours and sleepless nights worrying about one thing or another, their mind rolling over the same negative thoughts.
The mind can cause emotional and physical stress when we allow it to take hold of us. Learn to watch the mind passively and understand that the mind is not you.
Only the mind lives in the past and future; you always live in the present. Only the mind can travel in time; you are always experiencing the present moment. It is when we live in mind that we lose the experience of the present. Only in the present moment can you cause change.
The mind is a wonderful tool; however, it is a terrible master. Learn how to master the mind. Don’t take it too seriously. Make it yours and understand it has no power other than that which you give it,
Here is an excellent 4 minute video on YouTube that I highly recommend: Alan Watts/The Mind