There seems to be a great deal of clamor lately regarding the battery life of the iPhone with the release of iOS 5. Turn Notification Center off for all those apps you don’t need to hear from. The ongoing network activity required to support those notifications can drain your battery.
In iOS 7 the procedure has changed a little. Go into Settings and select “Notification Center”. Scroll down to the “INCLUDE” section of this window and find Messages. Select Messages and scroll down to the “Show Preview” section. From there, you can turn preview on and off. See image to the right.