Imagination is part of meditation. We should meditate on God's Word. Imagination affects your future actions. For a person to change, their thinking has to change. Reality is more than what you can perceive through your physical senses.
Every scientist believes that.
They acknowledge radio waves exist which you are not physically aware of. Yet, anyone with an inexpensive receiver can pick up those signals which are all around you. Everyone in the civilized world today believes this. But 300 years ago almost no one believed it. Those who believe the Bible, know there is a reality which surrounds us which unbelieving people are largely unaware of.