impossible to understand

References in classic literature ?
In verse 20, Zarathustra makes yet another attempt at defining his entirely anti-anarchical attitude, and unless such passages have been completely overlooked or deliberately ignored hitherto by those who will persist in laying anarchy at his door, it is impossible to understand how he ever became associated with that foul political party.
But it is so difficult, and even impossible to understand, that surely I am not to be blamed because I could not fathom the incomprehensible?
Mr Borden said: "All of her friends and colleagues who knew her better than me find it impossible to understand.
The daily reported Borden as saying: "All of her friends and colleagues who knew her better than me find it impossible to understand.
It is impossible to understand what they must be going through.
In this volume, an international group of scholars set forth new understandings of the conditions of contemporary African cultural production; arguing that it is impossible to understand African cultural productions without knowledge of the structures of production, distribution, and reception that surround them, their essays grapple with the shifting notion of what "African" means when many African authors and filmmakers no longer live or work in Africa.
While it's impossible to understand those who routinely depart when a match remains in the balance, I've left early on the last two occasions I paid to see my own laughably-poor team, both when they were 3-0 down at home, on their way to 5-0 and 5-1 hidings.
Since the public budget is formed in various formats, it is impossible to understand its exact specifications, the expert added.
It is impossible to understand what this group is trying to accomplish without looking back to Washington DC.
First and foremost, readers will find it impossible to understand just how such a loan was ever agreed in the first place.
The workers over there do not speak English and are often therefore impossible to understand.
The result is impossible to understand but playing the way we are playing I am certain we will be fighting for the league in May.