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.
NASB 1995
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.
RVR 1960
Nunca se apartará de tu boca este libro de la ley, sino que de día y de noche meditarás en él, para que guardes y hagas conforme a todo lo que en él está escrito; porque entonces harás prosperar tu camino, y todo te saldrá bien.