Go as far as you can see; when you get there you'll be able to see farther.
You can do more, you can always do more.
Life is too short to be little. You must enlarge your imagination and then act on it.
Basically, I try to look at everything I do as a stretch.
I always think you should push your envelope every chance you get.
You never want to rest on your laurels. You want to keep doing things that terrify you.
You have to go to your limit to progress.
Doing what you do well is death. Your duty is to keep trying to do things that you don't do well, in the hope of learning.
And to learn, you have to be willing to push yourself.
You need to live a little bit outside your comfort zone because you can be even more than you dream of.
Don't just read the easy stuff. You may be entertained by it, but you will never grow from it.