Joshua 1:8,9

This book of the law shall not depart 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 month, 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 thy private actions and public administrations. I command thee I whom thou art obliged to obey: I who can carry thee through every thing I put thee upon: I of whose faithfulness and almighty power thou hast had great experience!