Harm - a Christian perspective
These words of comfort were originally spoken to the Israelites living in exile in Babylon. God assured them that despite their present difficulties, He had plans for them--plans for them to prosper and not to be harmed. We don't share that historical context, but God's promise remains: He knows of our struggles and is working to help us prosper, even when we can't see it.
http://biblegateway.com/passage/?search=Jeremiah.29:11&version=NIV