If you keep telling lies, you will eventually get to the point that you are believing your own lies. This will eventually hurt you because, in your own mind, you expect the lies to be the truth, but it is not the truth and you will be constantly disappointed. This will also tend to make you unhappy.
A person once told me this little story: When talking to someone that is not a believer in a religion, just ask them that if they are right, and I am wrong, what have I lost but if I am right and they are wrong, what have they lost? Here are some books on religion.
