"Invincible in the heart, invincible in the world ~!" How to understand it?

First of all, LinYu once told me not to ask others for help, but don't forget to help yourself. This time it affected me more or less.

First of all, if you don't treat others as opponents, you can learn well. If you surpass him, don't hate him. Sometimes it is actually jealous of others, just like Japan. We hate others every day and shut them out. We are psychologically dissatisfied with Japan, but if you look at Japanese technology, we should think about it.

This is just like studying now. If you think this teacher is good, you think his classes are interesting to learn, and vice versa ~

Being invincible in this heart means that we should go on the road with confidence far beyond reaching our destination.

The other thing is,

You face the sun, there is a light in front, and your back is to the sun. What you see is your own shadow. You are your own enemy, and only you can defeat you. You are your God, and only you can save you.