Google this: speeches given by popes + "free will"
The first few links look good

.
"The
Pope gave a remarkable
speech at the University of Regensburg yesterday,
... view of human
free will by quoting a Byzantine (and Orthodox) emperor!
..."
"Lately the
pope had to cancel a
speech he was planning to give at a physics
... Free Will ·
Pope and free
speech · Religion knowledge and revelation
..."
"Apr 17, 2008
... “Rotunda” Hall of the
Pope John Paul II Cultural Center of Washington, D.C.
... their nature as creatures endowed with reason and
free will.
..."
Apparently the Pope gave a speech recently that touched on Free Will and other touchy subjects, so you may have to filter through useless things to find what's worth it

.