You must learn to forgive yourself as easily as you forgive others. And then take a further step and use all that energy that you used in condemning yourself for improving yourself. After that I really started to get somewhere - because there's only one person you can change and that's yourself. After you have changed yourself, you might be able to inspire others to look for change.
When you have found inner peace, you are in constant contact with the source of universal energy and cannot be tired. . . You have endless energy.
