The author is troubled "by my uneasy sense of profound moral differences."

"I see no moral difference between keeping knowledge in one's head and on a chip," he said.

But a philosophical or moral difference is also at work.

Can the Pope's visit make a moral difference to America?

Of course there's a difference, but it's not a moral difference.

None mentioned any moral or ethical difference in the various courses of action.

She is also a rival to Lucy because of their moral differences and competitive attitude.

What is the moral difference, if any, between the soldier and the civilian?

There's no moral difference between one and ten thousand, I assure you.

Often it is hard to find the moral difference between political and police terrorism.