What will Cameron tell his MPs?

As Boulton & Co. are reporting, Cameron's marshalling his MPs for a meeting this evening - "all must attend", apparently.  As things go, it's hardly earth-shattering news. But it's a nice insight into the Team Cameron approach, nonetheless.  What will be said?  Sky's source summarises the message as "We're in for the long haul. Mustn't get complacent".  With the Crewe & Nantwich by-election only a couple of weeks away, such pep-talks could pay dividends.