When he says, "Be strong in Lord and in the power of His might..." I believe what Paul is saying, is this, "Be WISE [in] the Lord and in the MEANS [of] His might... and the "might" he's speaking of is the might and stability that comes from His knowledge, understanding and discernment. There's plenty of other truths to support this thought... but one the clearest indicators is the way he explains the method and gauntlet of attacks that the the enemy will us to distract and deceive.
Notice the method... Paul uses terms like principalities, powers, rulers to drive home the point that our battle is not physical but mental. It's a battle ideas and thoughts. Think about it in the natural realm...
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