For now, even with all that is known about genes and cells, deep mysteries remain.

It touched on deep cultural mysteries and religious traditions at the core of the culture.

Some deep and unending mystery at which he could only guess.

The reason mathematics is so effective, he says, remains a deep mystery.

They had only led us, however, to a deeper and far more tragic mystery.

No more false starts, as in the pleasure gardens, but the real beginning of a deep mystery between them.

Who attacked Eddie and where remained a deep mystery late tonight.

The professors were not priests initiated into the deep mysteries of life and knowledge.

The sound added to the sense of deep mystery.

I don't know what the deep dark mystery is.