After a full chapter of confronting the rabid unbelief of the Pharisees and enduring their personal, ad hominem attacks, Jesus turned the tables and told them exactly why they couldn’t understand or receive, believe His Words. He said,
Question: “Why do you not understand My speech?”
Answer: “Because you are not able to (or, cannot, it is an inherent impossibility) listen to My word.”
They’re not able, they can’t. Listening to His words is an inherent impossibility to them.
Did you ever wonder why and how this fits with being His sheep in John 10? If so, then keep listening.
The following is a study on John 8:37-59.