"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." Joshua 1:8

Speak of it - This book of the law ... out of thy mouth
Study it - thou shalt meditate therein day and night
Submit to it - thou mayest observe to do according to all that is written therein
Strive after it - then thou shalt make thy way prosperous
Succeed in it - then thou shalt have good success