What to Say, and to Whom

I came across a C.S. Lewis quote today that I thought was very wise. Speaking of Christians who disagree on various matters he said...

“Our divisions should never be discussed except in the presence of those who have already come to believe that there is one God and that Jesus Christ is His only Son.”

I think it goes along pretty well with my policy (learned from Frs. Tom Hopko and Tom Allesandroni) not to talk about Mary, saints, theories of justification, relics, the bishops, the feasts and fasts, the mark of the beast, prayer ropes, etc. with non-Christians. All they need to hear (e.g. the life and words of Jesus) is contained in the four Gospels. They shouldn't even hear the Epistles because those are for people who already believe.