I am sure you go trough your life honestly and this honesty brings a peace to your heart. There are many liars in this world. Some people lie because they are scarred or they want to be admired. For example when boys say that they were fighting with this big monster and after a long fight they've won, they want to be appreciated, want to feel important, in the centre of attention and want other people to see them stronger, better than they really are. But really what they are doing, they are fulling themselves and their lies are nothing more than the result of low self-esteem. Lies only deepen the problem and always sooner or later they become obvious to others. But these liars are not that harmful, they mainly harm themselves.
The worst type of liars are people who lie to achieve something: money, power, leadership. But you know what - we can only have pity on them, they are sad, horrible people who don't know the true values in life. They are not able to love, to care, to be friend, to be open, helpful without expecting anything. They are very ugly people. They may not look ugly in the mirror, but their soul, thoughts and doings are ugly. I have pity on them.