Saw this inspirational billboard on the way home from work the other night. Tell that to King Saul. Or to Eli's sons Phineas and Hophni. The fact is, there are times when God fires his apprentices.
I suspect the billboard's sponsor was trying to point out that God said he will "never leave us or forsake us," and he is right in doing so. Nevertheless, the Bible is pretty clear that we can reject Him. And when we do, God will write Ichabod over our ministry and find someone else to do the work of the Kingdom.