Proverbs 22:17

Listen carefully and hear the words of the wise, and apply your mind to my knowledge; for it will be pleasant if you keep them in mind (incorporating them as guiding principles); Let them be ready on your lips (to guide and strengthen yourself and others).

God recommended that Joshua continually meditate on the Book of the Law to gain wisdom and have success. Paul recommends we renew our minds with the word for our success. Our job is to listen carefully to the wise and apply it to our lives. Wisdom is key to overcoming here on this earth, and God guides us with the bible.