Answer:
the Bible = especially important to study
the devil = hates God and his people
temptation = main way Satan causes problems
the world = a system of relationships, ideas, and values opposed to the Kingdom of God
God's desire = that our minds be renewed and we become more like Christ
Christian faith = overcomes the world
maturity = the result of growth in Christ
service = "washing the feet" of others
the flesh = resides in the mind and intellect
growth = normal for Christians
fellowship = God does not want us to neglect this key to growth in Christ
prayer = most important key to growth in Christ