"The apostle Paul, under the inspiration of the Holy Spirit, did a masterful job of explaining it in 2 Corinthians 10:5. Basically, a stronghold is any argument or pretension that "sets itself up against the knowledge of God." The wording in the King James Version draws a clearer image of a stronghold: "every high thing that exalteth itself against the knowledge of God." A stronghold is anything that exalts itself in our minds, "pretending" to be bigger or more powerful than our God."