My sentence (first half): We have a strong desire to either appreciate beauty or to tear it down, and this conflicting feeling is a part of our lives.
My sentence (second half): There’s a painful truth in how we can hurt something we love, only to realize our mistake and try to fight for it afterward.
My response: When Montague talks about the “double edge of impulse,” he means that our feelings can lead us in two very different directions: we can choose to celebrate and protect beauty or, at the same time, we can hurt it.