I loaded up Minecraft and all of a sudden these messages appeared which described everything I was doing.
I don't know where these messages came from, since I didn't install a mod intended to produce them.
The only mods I have installed are Optifine, Iron Chests, Better Furnaces, and X-Ray.
The descriptive messages I'm referring to can be seen in the lower right corner of this screenshot:
Does anyone know what could be causing this?