Meanings of singular prudence in English

While therefore we are admiring his singular prudence, can we at the same time fear his folly?

Aristides acted with a singular prudence.

He has great powers of observation, and possesses singular prudence, without anything about him that can be called cold or morose.'

I think, indeed, that this young gentleman and his cousin, the young Count of Laville, have shown singular prudence and forethought, as well as courage.