There has always been a philosophical problem about the nature of God.

He raised the question of black suffering as a philosophical problem.

For an example of a philosophical problem, see the God paradox.

He seemed to be wrestling with some huge philosophical problem.

"I have a philosophical problem with the idea," he said.

The God paradox is a good example of a philosophical problem.

"What you're dealing with is a very deep philosophical problem," she said.

His area of study was historical, literary, philosophical and religious problems.

But in the meantime, the front half of his attention was busy with a philosophical problem.

There they searched for answers to the political and philosophical problems of their time.