If you have ever been hiking in the mountains, you'll know what a false summit is: when you reach a peak that appeared to be the pinnacle of the mountain but see that the true summit is even higher. False summits can cause hikers to give up, despairing of ever reaching their goal.
This experience happens to us in our own lives, and it happens to Saint Peter in the Gospel today. We can get to the top of a summit and be so excited that we forget that the true summit still lies beyond us—in Heaven. But if we learn to look at the false summits as signs of the peak, we can actually regain strength in those moments, because we remember where our life is ultimately headed.