Please know our prayers are with you in this difficult hour.

So, she had spent the long difficult hours thinking about Richard.

"This is the most difficult hour, and I want to be with you."

"And you have been unfailingly gracious in a difficult hour."

"I address myself to you, the leaders of nations, in this difficult hour of history," he said.

Many police officials said that the job, with relatively low pay, difficult hours and its inherent risks, is simply a hard sell.

Surely, in this difficult hour we Americans can find common ground on which to build a safer and a better future for our children.

"We have some difficult hours ahead, men," he said, "but we'll live through them."

In this difficult hour our thoughts are with the victims and their loved ones.

To what extent is it possible to work difficult hours and still maintain a high level of safety?