The way I read it was that he’s using “impossibilities” to mean things that you don’t think are possible, don’t understand, or find inconceivable rather than things which can’t actually happen.
A probable impossibility is something that will probably happen that a given person doesn’t think is possible. An improbable possibility is something that that same person understands, but (whether you know it or not) isn’t probable.
I read ‘probable impossibility’ as ‘something that is probably impossible’. It’s a poor translation if it means something else; but your version at least makes some kind of sense.
The way I read it was that he’s using “impossibilities” to mean things that you don’t think are possible, don’t understand, or find inconceivable rather than things which can’t actually happen.
A probable impossibility is something that will probably happen that a given person doesn’t think is possible. An improbable possibility is something that that same person understands, but (whether you know it or not) isn’t probable.
I read ‘probable impossibility’ as ‘something that is probably impossible’. It’s a poor translation if it means something else; but your version at least makes some kind of sense.