Peace I leave with you; My peace I give to you. I do not give to you as the world gives. Do not let your hearts be troubled; do not be afraid. — John 14:27

The world's peace depends on circumstances; Christ's peace comes from His finished work. The world gives and takes away; Christ gives and never retracts. His peace passes all understanding because it is rooted in what He has done, not what we feel. He says these things so that in Him we may have peace—not that we would not have trouble, but that we would have Him in the trouble.