Here's something else that blocks our power flow, from Pastor Bayless Conley's Answers for Each Day.
1 Peter 3:7 says,
Husbands, likewise, dwell with them with understanding, giving honor to the wife, as to the weaker vessel, and as being heirs together of the grace of life, that your prayers may not be hindered.
Notice it says, "Husbands, likewise," which means, gals, you are not off the hook. The following truth applies to you as much as it does to the boys.
That truth is simply this: If there is bitterness or unforgiveness in your heart toward your spouse, your prayers will be hindered. That word hindered literally means to be cut down in the same way one would cut down a tree.
I once had this incredible tree called a cherimoya tree. One of the things about a cherimoya tree is that it is not indigenous to our country, and the insects that pollinate it do not exist here.
In order for the tree to bear fruit, I needed to pollinate it by hand with my little artist paintbrush. I would get pollen on the brush from one flower and pollinate other flowers.
Eventually the little buds I had pollinated began to turn into fruit. I was so excited! They were getting close to the time to be harvested. Then I came home one afternoon to find my whole tree hacked to pieces. Every branch and piece of fruit was in the trash. The gardener had cut my tree down!
I believe that can happen with our prayers. You can be intensely committed spiritually, searching the Scriptures, filling your heart with the Word, praying from the bottom of your heart, but if you are not honoring your spouse or you are treating them in a bad way, the devil has the authority to waltz right in and chop your prayer tree down.
Let's keep the ax out of the devil's hand by honoring and forgiving and valuing our marriage partner.