When you've got something to prove, there's nothing greater than a challenge.

I wanted to be scared again... I wanted to feel unsure again. That's the only way I learn, the only way I feel challenged.

Mountains cannot be surmounted except by winding paths.

There are only two problems in my life. The political ones are insoluble and the economic ones are incomprehensible.

I love the challenge.

If we do not rise to the challenge of our unique capacity to shape our lives, to seek the kinds of growth that we find individually fulfilling, then we can have no security: we will live in a world of sham, in which our selves are determined by the will of others, in which we will be constantly buffeted and increasingly isolated by the changes round us.

Life's challenges are not supposed to paralyze you, they're supposed to help you discover who you are.

You have to erect a fence and say, "Okay, scale this."

It isn't the mountain ahead that wears you out; it's the grain of sand in your shoe.

To be tested is good. The challenged life may be the best therapist.

The real challenge (in life) is to choose, hold, and operate through intelligent, uplifting, and fully empowering beliefs.

When people keep telling you that you can't do a thing, you kind of like to try it.

When someone tells me there is only one way to do things, it always lights a fire under my butt. My instant reaction is, "I'm going to prove you wrong!"

It's always the challenge of the future, this feeling of excitement, that drives me.

Dreams can often become challenging, but challenges are what we live for.