Underscoring favorite passages in your Bible is a real aid to memorization. Writing in the margins and blank spaces on the pages is a good way to record thoughts, sermon titles, and Scripture references you do not want to lose. Symbols, colored markers, and other systematic methods can be used to highlight important or doctrinal passages.
Marking in your Bible is not a sign of disrespect or an attempt to add to or take away from the Bible. Actually it is a sign of care, love and study of God’s Word.