From http://bugs.debian.org/542509:

#v+
$ gpg2 --quiet --decrypt <msg.enc >/dev/null
gpg: anonymous recipient; trying secret key DEADBEEF ...
gpg: okay, we are the anonymous recipient.
#v-

It contrasts with:
#v+
$ man gpg2 | grep -B1 -- 'as quiet as possible'

-q, --quiet
       Try to be as quiet as possible.

#v-