Know yourself !!!
The best way to assess yourself is by focusing on qualities that lie within your control and not dependent on external factors. You can’t control what happens at your job place or on the marital front or how your friends behave or how your family treats you but you can most certainly be in control of your own thoughts, behaviour, attitude, outlook, approach, feelings, mind-set and so on. Recognize the difference between these two and once you are aware of yourself nothing can shake your self esteem or disturb your peace.