“It's got a challenging climb -- I like the exercise aspect.”

“Merck faces a challenge in future trials of addressing the company's behavior.”

“This is the cornerstone of the government's policy and a major mid- and long-term challenge.”

“It appropriately reflects the business challenges we have experienced in this period,”

“We believe that this is a constitutional bill and it will meet the various kinds of challenges.”

“the most profound challenge yet faced by the British Muslim community.”

I could not believe in a God that would challenge faith like this.

In the pursuit of wholeness, there will surely be challenges but you need to keep going.

But that's the challenge -- to change the system more than it changes you.

Challenge yourself first and later no one can beat you.