Worry and Peace cannot coexist.  Why would Jesus chose to give us peace as the last thing he did before he left the earth? He tells us in the scriptures that "peace is his legacy".  Jesus doesn't want us to just "live in peace", he wants us to the embodiment of peace.  When we have peace (his peace) we can truly be what he created us to be, we have full access to ourselves and can think logically/rationally, as well as creatively.  Versus, using our thinking and creativity for survival.  Having the feeling of peace allows us to thrive, because peace gives us tremedous amounts of energy.  Jesus accomplished so much because he was at peace, he had God's peace which  enabled him to walk out his calling without wavering.  Having Jesus in you means you get to have “his” feelings. Not just knowing it cognitively; how he wants you to feel, but we actually get to feel the “way “ he feels. In the same way you might wish you could have someone feel the way you feel, so they really understand it (both positively and negatively). When we are overwhelmed by problems and circumstances, we can look at Jesus and borrow His peace. My peace I give you.