The people Christ was addressing were physically hearing Him (pressure waves, sound waves - sensory perception and reasoning) but they could not spiritually hear Him. They did not have "ears to hear" which is a gift of the Father.
And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father. John 6:65
I lost a verse - perhaps you know where it is?
New Testament - a directive that you should witness twice to anyone, and if you’re rejected the second time, move on, because there are thousands of others needing to hear who will be more receptive. It parallels the parable of the sower.