Joshua 1:8 is just one verse in the Bible, yet it is full of great wisdom. The wisdom stated here is repeated throughout the Bible many times, different wording, sometimes in part, sometimes in full, but always stating the importance of knowing the Bible. That is why this verse is such a great verse to begin a Devotional study.
Keep the Law Always on Your Lips
Joshua 1:8 first states "This Book of the Law shall not depart from your mouth," this reminds us of the importance of constantly reading and discussing the word. The Bible is one of the primary ways God speaks directly to us.
God wants us to search the bible ourselves, because it is the only way we can be assured that what we believe is truly based on biblical principles, not based on someone else's beliefs. Think back when you and your friend's used to play telephone. The further down the line, the words get confused, until the message does not even resemble what it started as. This can also happen, when our primary bible teaching is in devotions from other people, not God's inspired word. Learning from others is great; He wants us to go to church, bible study, retreats, but He also wants us to crack open our Bible and read it and not just once a week.