Joshua 1:8

8. This book of the law Already had revelation solidified itself into a book form. The wisdom of God in selecting this form will be evident when we consider, (1) That the human race instinctively put into monumental form all the great truths, laws, discoveries, and historic events which they wish to perpetuate; (2) The untrustworthy character of oral traditions; (3) The difficulty of corrupting documents intrusted to the guardianship of a class solemnly set apart for that purpose, and imbued with a religious awe for the very letter of the sacred manuscript, or as published to the world by the multiplication of copies scattered abroad through all lands.

Shall not depart The written divine law shall be a theme of constant study, thought, and conversation, the rule of both his private and official life.

Shall meditate The Hebrew word הגה , sometimes means to mutter, speak aloud, but “we are not to think of this meditation as a learned study, nor as a ‘reading aloud,’ as Bunsen explains it, but rather as a mature reflection upon the law, by which Joshua should penetrate more deeply into its meaning.” Fay. Happy is the nation of Bible readers ruled by one who receives the law at the mouth of God!

Have good success Rather, act wisely. Compare Joshua 1:7.