Isaiah 6:9-10 English Standard Version (ESV) And he said, “Go, and say to this people: “‘Keep on hearing, but do not understand; keep on seeing, but do not perceive.’ Make the heart of this people dull, and their ears heavy, and blind their eyes; lest they see with their eyes, and hear with their ears,
and understand with their hearts, and turn and be healed.”
Do you see the quote within quotes? There is a distinct separation of comments meant to separate cause and effect. Those who were entrusted with teaching the people did not have spiritual ears and eyes. They did not have the ability to relate to the people how to have their spiritual ears and eyes opened. You can only teach what you know. They did not know.
Jesus came and saved us from this ignorant condition. When we accepted Jesus Christ into our hearts the Comforter was sent. Look at the second parenthetical line. “Understand with their hearts.” Spiritual ears and eyes only belong to those who have accepted Jesus into their hearts.
The primary principles of acceptance now come into play. We have accepted Jesus Christ as Lord and Savior. Obedience can only come if we hear His commands.
John 14:15-16 English Standard Version (ESV)
Jesus Promises the Holy Spirit
15 “If you love me, you will keep my commandments. 16 And I will ask the Father, and he will give you another Helper, to be with you forever,
Love is shown by obedience and His commands are relayed to us by the Holy Spirit.
John 14:26 English Standard Version (ESV) But the Helper, the Holy Spirit, whom the Father will send in my name, he will teach you all things and bring to your remembrance all that I have said to you.
The Holy Spirit teaches all things, including how to open our spiritual ears and eyes.