For any scientist the real challenge is not to stay within the secure garden of the known but to venture out into the wilds of the unknown.

The biggest challenge of Gods people is ignorance. Ignorance has become a mountain and a stronghold even in Christian churches

When we accept tough jobs as a challenge and wade into them with joy and enthusiasm miracles can happen.

This is one of the greatest challenges of our time: to convert ourselves to a type of development that knows how to respect creation.

Darlin’, you can’t tell me your ex wasn’t adventurous and not expect me to see it as a challenge.

There are many challenges to long distance running, but one of the greatest is the question of where to put on's house keys.

When I am encouraged, I never see obstacles in my way, only exciting challenges.

We can smile when facing a challenge, if we believe in ourselves that we won’t back down.

Courage is chief among virtues. For when any virtue is challenged, it is courage alone that can restore virtue.

The further you get away from yourself, the more challenging it is. Not to be in your comfort zone is great fun.