Sometimes, we are defeated by a rumor. This happened in I Kings 19:7 (repeated in Isaiah 37:7) to a powerful Assyrian leader called a Rabshekah. He heard a rumor, returned home and was later killed there. This was the man who stood outside the walls of Jerusalem, shouting and trying to scare the inhabitants into surrender.
How often do we hear a rumor and run? Speaking for myself, more often than I like to think. The world is sometimes a very scary place, but for those who put their trust in the Lord, peace is only a breath or a heartbeat away. Though you may suffer immediate alarm in a given situation, take a deep breath and remember. Greater is He that is in me, than he that is in the world (I John 4:4).