Jesus' mention of "the gates of hell" to Peter is often interpreted as our need to "regroup behind the walls" because hell's gates are in our face and at our heels. The opposite is true.
Jesus in coming to Earth is God's all-out war vs the gates of hell, his passion, death, & resurrection demolished the gates of hell, and our very existence as Christians is a threat to hell and its gates in people's souls.
We are Jesus' army on the move! Glory be to God!
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