It's easier to overcome weaknesses that you know are there vs. the ones you don't know are there. Oneself today has to be better than yesterday's self. Another teacher told me to love people and life. I was taught to love life and to warm people with love. I feel like I am common, but when my books are translated into other media, I can affect more people's lives.
Teenagers never think that old people used to be young.
When I was young, I had energy and wanted to change the world. I would write all my thoughts down in my notebook about how I wanted to change the world. This is good advice.