“Our challenge has never been convincing the world that it is wrong to kill baby seals for their skins; the challenge has been telling the world that the hunt goes on.”

You walked in, and the air changed. It gives you an advantage and you're enough of a challenge. I'm not trying to be a challenge. It's one of the things that makes you one.

The cognitive science's challenge is to link our consensus reality to our internal reality, but physics' challenge is to link our consensus reality to our external reality.

These days no one challenges us,' he said. 'And because there is no challenge, there is no reason to work hard. And with no reason to work hard, we have all become lazy.

“It's going to be a challenge, but we're moving ahead,”

“Our challenge is not getting big, and the temptation is great,”

“We challenged the girls at halftime to step up.”

“I think the challenges are really going to be significant.”

“this is not a weekend hunt, ... but rather a season long challenge.”

“The goals of this program are extremely challenging and success is uncertain,”