What is scandal? Scandal is saying one thing and doing another; it is a double life, a double life.
Source, in full
Homily at the morning Mass at the Casa Santa Marta (23 February 2017), as quoted in "Pope: Don't put off conversion, give up a double life" at Vatican Radio (23 February 2017); also quoted in "Did Pope Francis Say It Was Better to Be an Atheist Than a Bad Catholic? at snopes.com (28 February)