Joshua 1:8 in the King James Version
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.
Context
7 Only be strong and very courageous. Be careful to observe to do according to all the law which Moses my servant commanded you. Don’t turn from it to the right hand or to the left, that you may have good success wherever you go.
8 This book of the law shall not depart from your mouth, but you shall meditate on it day and night, that you may observe to do according to all that is written in it; for then you shall make your way prosperous, and then you shall have good success.
9 Haven’t I commanded you? Be strong and courageous. Don’t be afraid. Don’t be dismayed, for the LORD your God is with you wherever you go.”