KJV : This book <05612> of the law <08451> shall not depart <04185> (8799) out of thy mouth <06310>; but thou shalt meditate <01897> (8804) therein day <03119> and night <03915>, that thou mayest observe <08104> (8799) to do <06213> (8800) according to all that is written <03789> (8803) therein: for then thou shalt make <06743> (0) thy way <01870> prosperous <06743> (8686), and then thou shalt have good success <07919> (8686). {have...: or, do wisely}NASB : "This book of the law shall not depart from your mouth, but you shall meditate on it day and night, so that you may be careful to do according to all that is written in it; for then you will make your way prosperous, and then you will have success.NASB# : "This<2088> book<5612> of the law<8451> shall not depart<4185> from your mouth<6310>, but you shall meditate<1897> on it day<3119> and night<3915>, so<4616> that you may be careful<8104> to do<6213> according to all<3605> that is written<3789> in it; for then<227> you will make<6743> your way<1870> prosperous<6743>, and then<227> you will have<7919> success<7919>.