I am not asking that You take them out of the world, but that You keep them from the evil one. They are not of the world, just as I am not of the world. Sanctify them by the truth; Your word is truth.…
Jesus understood the works of the evil one, he understood that for us to remain set apart it must be done constantly through the word of God. Thus he prayed God to keep us away from the evil one through his word (the Truth).
As long as you are on earth, the evil one will always come checking, He may come through an evil business proposal, a naked lady on a sign board, a lecturer insisting you must have sex with him before passing his course. Whatever form he comes, to defeat him and stay sanctified, you must know and apply the truth in the word of God.
The word of God gives life, it gives revelation, understanding, the word of God empowers you in time of trouble, the word of God builds your faith, the word of God exposes the schemes of the devil, the word of God defeats the devil.
The word of God is food for the spirit. To keep your spirit man healthy and fulfilling the will of God, get as much of the word of God as possible. The word of the lord is your spiritual sword helping you to stand in the day of evil (Ephesians 6:13).