Joshua 1:8

This Book of the Law shall not depart from your mouth, but you shall meditate in it day and night, that you may observe to do according to all that is written in it.  For then you will make your way prosperous, and then you will have good success.

When we focus, we pay attention and listen to what is being said.  The bible is meant to be focused on or meditated over in small chunks.  No one can read the whole section of Corinthians and know it, but we can focus on one line or a paragraph and learn it.  We all want to have good success and prosper, but wisdom takes time to learn.  The bible teaches us the wisdom to overcome in this life if we just give it the time.