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, but thou shalt meditate thereon 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.

Let not the book of this law depart from thy mouth: but thou shalt meditate on it day and night, that thou mayst observe and do all things that are written in it: then shalt thou direct thy way, and understand it.

This book of the law shall not depart from thy mouth; and thou shalt meditate upon it day and night, that thou mayest take heed to do according to all that is written therein; for then shalt thou have good success in thy ways, and then shalt thou prosper.

This book of the law shall not depart out of thy mouth; but thou shalt meditate in it 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.

the book of this law doth not depart out of thy mouth, and thou hast meditated in it by day and by night, so that thou dost observe to do according to all that is written in it, for then thou dost cause thy way to prosper, and then thou dost act wisely.

This book of the law shall not depart out of your mouth; but you shall meditate therein day and night, that you may observe to do according to all that is written therein: for then you shall make your way prosperous, and then you shall have good success.

Let this book of the law be ever on your lips and in your thoughts day and night, so that you may keep with care everything in it; then a blessing will be on all your way, and you will do well.

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 ways prosperous, and then thou shalt have good success.

The book of this law shall not depart from your mouth. Instead, you shall meditate upon it, day and night, so that you may observe and do all the things that are written in it. Then you shall direct your way and understand it.

Non recedat liber legis hujus ab ore tuo; sed mediteris in eo, die et nocte, ut custodias et facias, secundum id totum quod scriptum est in eo. Tunc enim secundas reddes vias tuas, et tunc prudenter ages.

This book of the Law, etc Assiduous meditation on the Law is also commanded; because, whenever it is intermitted, even for a short time, many errors readily creep in, and the memory becomes rusted, so that many, after ceasing from the continuous study of it, engage in practical business, as if they were mere ignorant tyros. God therefore enjoins his servant to make daily progress, and never cease, during the whole course of his life, to profit in the Law. Hence it follows that those who hold this study in disdain, are blinded by intolerable arrogance. But why does he forbid him to allow the Law to depart from his mouth rather than from his eyes? Some interpreters understand that the mouth is here used by synecdoche for face; but this is frigid. I have no doubt that the word used is peculiarly applicable to a person who was bound to prosecute the study in question, not only for himself individually, but for the whole people placed under his rule. He is enjoined, therefore, to attend to the teaching of the Law, that in accordance with the office committed to him, he may bring forward what he has learned for the common benefit of the people. At the same time he is ordered to make his own docility a pattern of obedience to others. For many, by talking and discoursing, have the Law in their mouth, but are very bad keepers of it. Both things, therefore, are commanded, that by teaching others, he may make his own conduct and whole character conformable to the same rule. What follows in the second clause of the verse shows, that, everything which profane men endeavor to accomplish in contempt of the word of God, must ultimately fail of success, and that however prosperous the commencement may sometimes seem to be, the issue will be disastrous; because prosperous results can be hoped for only from the divine favor, which is justly withheld from counsels rashly adopted, and from all arrogance of which contempt of God himself is the usual accompaniment. Let believers, therefore, in order that their affairs may turn out as they wish, conciliate the divine blessing alike by diligence in learning and by fidelity in obeying. In the end of the verse, because the term used is ambiguous, as I have already observed, the sentence is repeated, or a second promise is added. The latter is the view I take. For it was most suitable, that after the promised success, Joshua should be reminded that men never act skillfully and regularly except in so far as they allow themselves to be ruled by the word of God. Accordingly, the prudence which believers learn from the word of God, is opposed to the confidence of those who deem their own sense sufficient to guide them aright. [1]

Footnotes

1 - The French paraphrases the whole sentence thus: "Ainsi la prudence et sagesse que les fideles apprennent de la parole de Dieu, est opposee a l'assurance de ceux auxquels il semble bien qu'ils se gouvernent assez discretement et sagement, quand ils besongnent selon leur propre sens;" "Thus the prudence and wisdom which believers learn from the word of God, is opposed to the assurance of those who think they govern themselves discreetly and wisely enough, when they manage according to their own sense." -- Ed.

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.

This book of the law shall not depart out of thy mouth; but thou shalt meditate therein day and (f) 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.
(f) Showing that it is not possible to govern well, without the continual study of God's word.

This book of the law shall not depart out of thy mouth,.... He was often to read it, frequently repeat it, and speak of it, to refresh his own memory with it, and the memory of those about him. Jarchi restrains it to the book of Deuteronomy now before him:
but thou shalt meditate therein day and night; whenever he had any leisure from the important business of his office, whether by day or night, see Psalm 1:2,
that thou mayest observe to do according to all that is written therein; which frequent speaking of it, and constant meditation on it, would lead unto:
for then thou shalt make thy way prosperous, and then thou shalt have good success; in his wars with the Canaanites.

Out of thy mouth - That is, thou shalt constantly read it, and upon occasion discourse of it, and the sentence which shall come out of thy mouth, shall in all things be given according to this rule. Day and night - That is, diligently study, and upon all occasions consider what is God's will and thy duty. The greatness of thy place and employments shall not hinder thee from this work, because this is the only rule of all thy private actions, and publick administrations.