John 8:43

Why do you misunderstand what I am saying? It is because (your spiritual ears are deaf and) you are unable to hear (the truth) of My word.

Keeping our spiritual ears open to the truth of the word is important.  We are harder to deceive with lies from the enemy when we can hear clearly from God.  We distance ourselves from the truth when we turn away from the word and stop listening for the guidance of the Holy Spirit.