Hosea 4:6 my people are destroyed for the lack of knowledge; because thou hast rejected knowledge, I will also reject thee. Understanding has to do with knowing and knowing is the acquiring of information; you can only understand what you know.
Ignorant is the lack of understanding. As you lack the understanding about your time with God, the enemy will always have control over your body, soul and spirit. That is why; the reading of this book is so important, it will help you understand your time with God.