如果所有事都要百分之百肯定自己做得到才答应，那这世界有很多事都不用做不用想。
If you needs to be 100% sure on everything only then you will commit to it, then there're so many things in this world you wont have to courage to think and to do.
为什么不可以反过来想 – 因为你答应了她，所以你很想尽力做好。
Why not think about it in another way - because you've promised her, that motivates you to do your best.
如果你有一件事你不想做的话，你一定会找到借口。
If you really dislike doing it, you'll always be able to find an excuse for it.
相反，如果那件事你想做，你一定会找到办法。
In contrary, if you really want to do it, you can always find the way.
