Doctrine shows us which direction we should take
When we read the Bible we receive doctrine, which means we start to see where we should go. Through the reading of the Bible we are shown the direction for our thought life, our words and all other areas of our lives.
Besides, the Bible is profitable for reproof. Quite often we start walking the way the Bible has shown us, but then we somehow get distracted, lose the right direction and get sidetracked. It is through reproof that we are shown that we have taken the wrong path