The Spirit who inspired the Word is the Spirit who helps us wield the Word.
If the Word is called the Sword of the Spirit, we can rely on Him to help us wield it whenever we face trial and temptation. When they come - and they will - our eyes go to the Word and our dependence goes to the Spirit.
Just a brief example...
You get the call that every person dreads and the doctor uses the word cancer. In that moment there's a choice to be made: you can run to God or away from Him. The Enemy, of course, would want the latter. Every trial that we go through is a temptation to turn our back on God just like every temptation to sin is a trial to endure. Even in the Greek language, they're one and the same word.
If you run to God, you will find that the Spirit brings passages to my mind from the Word about hope and healing. Whenever you face discouragement or despair, the Spirit will wield the Word to help me fight those. You can preach the Truth to yourself so that your feelings don't rule your world but God does. You can turn those Scriptures into prayers and relate to God on the basis of what He has said.
On and on we could go. But the key is this:
The Spirit who inspired the Word is the Spirit who helps us wield the Word. That's how you do internal spiritual warfare.