So what's the secret? The answer comes down to a simple choice. We can all choose to do certain things every day of our lives. Some things we do will make us unhappy, and some things we choose to do will make us happier. I have reasoned that if we follow a few basic "Rules of Life," we tend to get more done, shrug off –струсить- adversity –враждебность- more easily, get more out of life, and spread a little happiness around us as go further. People who play by the Rules seem to bring their luck with them, light up a room when they enter, have more enthusiasm for life, and cope –справляются- better.
все учачаствовавшие в переводе сделали эту ошибку - не написали by перед observing.
doing - параллельное действие. I love eating my lunch watching people out of the window.
by doing - способ достижения результата. I get wiser by watching people around.