改变的秘诀是将你所有的精力集中在建设新事物上,而不是与旧事物斗争。
The secret of change is to focus all of your energy, not on fighting the old, but on building the new.
The only limit to our realization of tomorrow will be our doubts of today.
The world is full of beauty and ugliness, and it's up to us to choose which one we want to see.