Have you ever wondered how God can desire one thing and yet determine that another thing actually come to pass ?
I have too.
This is an article by John Piper called : " Does God have two wills ? " I found it helpful in explaining the relationship between man's responsibility and Divine sovereingty.
http://www.desiringgod.org/ResourceLibrary/Articles/ByDate/1995/1580_Are_There_Two_Wills_in_God/