Brief practice sessions may help, with you playing the part of a relative or a workmate who asks him to explain his beliefs.
وَلَا شَكَّ أَنَّ مِثَالَكَ ٱلْجَيِّدَ سَيَكُونُ لَهُ تَأْثِيرٌ إِيجَابِيٌّ فِيهِ .‏ —‏ لوقا ٦ :‏ ٤٠‏ .‏