It was a prime example of rarefied speculative thought, containing no explanatory text at all.

Long ago, when Moon bases and matter transmitters were at most subjects of speculative thought among your people, I served my apprenticeship on this planet.

He assumed an unsympathetic attitude toward speculative and religious thought in general.

He believed that the scholars of the other schools made the teachings too complicated and disliked any kind of speculative thought.

But these formations invite all kinds of speculative thought.

And in the realm of pure speculative thought he was not great.

And speculative thought, which we so associate with modern science, is built on this difference.

The secondary literature on Musès devotes itself more to his speculative thought than to his mathematics.

I had a curious instant of purely speculative thought.

In later life, he gave up speculative thought and turned to scientific research, especially in mathematics, physics and astronomy.