“Peace I leave with you; My peace I give to you. I do not give to you as the world gives. [So] do not let your hearts be troubled and do not be afraid.” –John 14:27.
The kind of peace God gives to us is not the kind of peace the world gives. The world gives a temporary stillness. The peace of God is eternal–a peace for (and during) every situation now and a peace that lasts for all time.
(Read this verse slowly. Really understand the words. Meditate on them all day today – and anytime you feel stressed)