You have to be willing to sacrifice to get what you want or what you need.

Look up at the stars and not down at your feet. Try to make sense of what you see, and wonder about what makes the universe exist. Be curious.

现在你们不是国人的勇士，怎么能既学好学业又学好射箭呢？ 

We live in an era full of uncertainties, the only certainty is change itself.