From the words of Pope Leo XIII...
"Man, indeed, is free to obey his reason, to seek moral good, and to strive unswervingly after his last end. Yet he is free also to turn aside to all other things; and, in pursuing the empty semblance of good, to disturb rightful order and to fall headlong into the destruction which he has voluntarily chosen.
I was talking to a priest about a quote from Leo XIII I was going to put in the weekly bulletin and he said to me, "You can't go wrong with Leo XIII." :-)