When the disciples were helpless against the enemy, Jesus told them that power over Satan came only by praying and fasting. Why is this so? I believe it's because the Lord wants time to work on our inner man. He wants our heart completely attuned to Him. We simply cannot obtain any authority without having habitual communion with Him.
How can we expect to chase Satan out of our churches, our homes, our troubled children, if we don't pray? How can parents expect God to impart spiritual power to them when they argue, fight and gossip in front of their kids? How can they expect to possess authority when they go out drinking, and then fly into a rage when they learn their kids smoke pot?
Jesus could boldly say, "The prince of this world cometh, and hath nothing in me" (John 14:30). If you can't say this too, you'll remain powerless. And Satan will run rampant through your household.
Peter gives us a key to spiritual authority when he writes, "Ye wives, be in subjection to your own husbands; that, if any obey not the word, they also may without the word be won by the conversation of the wives" (1 Peter 3:1). The word for conversation here signifies lifestyles or behavior. I believe Peter is talking about the Bride of Christ. And the image here is of a wife who possesses true spiritual authority.
This woman submits to her husband because the Bible commands it. And because she allows herself to be governed by God's Word, her “hidden man” is being conformed to His divine image. Peter says that such a woman doesn't need to chide, harangue or preach at her husband. She'll be able to win him to Christ without saying a single word. How? Her witness is in the silent eloquence and power of her godly walk. This woman's husband may be obnoxious and overbearing. She may have to bite her tongue time after time. But because she is in submission—to God's Word and, in turn, to her husband—she is gaining spiritual authority day by day. A mighty power is being released in her that increases her authority over the enemy's hold on her husband.