“To bring the sublime into the mundane is the greatest challenge there is.”

“An unhatched egg is to me the greatest challenge in life.”

“The greatest challenge to any thinker is stating the problem in a way that will allow a solution.”

“Accountability is mankind’s greatest obstacle. All our challenges stem from that.”

“We're facing the greatest challenge there is in football: to play against an Italian team that only needs a draw.”

“One of the greatest challenges facing the economy is to achieve the most efficient use — not abuse — of natural resources”

“Only after Southwest Airlines became the most profitable airline in America did United and American challenge their long-held assumptions about how to compete. At worst, laggards follow the path of greatest familiarity. Challengers, on the other hand, follow the path of greatest opportunity, wherever it leads.”

““Quantum” brings a hand in fiction that challenges all conventional fixtures of control within the psyche of art.”

“...when we have more minds concerned, any challenge shrinks proportionally. The solution to our greatest problems may simply be involvement.”

“I know that I'm not the easiest person to live with. The challenge I put on myself is so great that the person I live with feels himself challenged. I bring a lot to bear, and I don't know how not to.”