What does it mean to be spiritually blind?

Spiritual blindness refers to the condition of the heart that is unable to recognize its own sinfulness and the need for God's grace. In the sermon, blind Bartimaeus is presented as a picture of every sinner's natural state—utterly unable to see or understand the things of God. Ephesians 2:1 describes this condition as being 'dead in trespasses and sins.' It is only through the illuminating work of the Holy Spirit that one can come to see their need for a Savior. When Bartimaeus cried out for mercy, he demonstrated an awareness of his blindness—a cry that God does not overlook, as He desires to reveal Himself to the lost.