Joshua 1:8 - Clarke's commentary and critical notes on the Bible

This book of the law shall not depart out of thy mouth; but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success. This book of the law shall not depart out of thy mouth - The law which had already been written by Moses, and from which he and the people were to take all those precepts by which their lives were to be governed. Though there was a copy of the law laid up in the sanctuary, yet this was not sufficient. Joshua must have a copy for himself, and he was to consult it incessantly, that his way might be made prosperous, and that he might have good success. If he kept God's word, God would keep him in body and soul; if he should observe to do according to that word, then God would cause all his way to be prosperous. Those who are obedient to God lack no manner of thing that is good.