John 14:27

Peace I leave with you; My (perfect) peace I give to you; not as the world gives do I give to you. Do not let your heart be troubled, nor let it be afraid. (Let My perfect peace calm you in every circumstance and give you courage and strength for every challenge.) 

Jesus left us peace and help in the form of the Holy Spirit to teach us in all things.  We are to not let our hearts be troubled or afraid but let peace reign.  Our focus, trust and confidence must be in what He tells us in the word and by the guidance of the Holy Spirit.  We must trust in the peace and take our eyes off what causes fear.