Hi Houstonpam,
i can see why you're stumped. It's an odd excerpt for teaching kids. IMO, that's the problem with the Revised Common Lectionary for Sunday School. Being from John does not help! (He always makes Jesus sounds cryptic.)
First thing I'd do is expand the reading for more context. Add verses 25-26 so you can see what Jesus is CONTRASTING: those who listen versus those who don't. GOOD passage for 5th-8th, don't you think 
--> 25 Jesus answered, “I did tell you, but you do not believe. The works I do in my Father’s name testify about me, 26 but you do not believe because you are not my sheep. 27 My sheep listen to my voice; I know them, and they follow me. 28 I give them eternal life, and they shall never perish; no one will snatch them out of my hand. 29 My Father, who has given them to me, is greater than all; no one can snatch them out of my Father’s hand. 30 I and the Father are one.”
Ideas:
Create demonstration games that illustrate:
- Listening v not listening,
- Hearing v Not paying attention
- "Follow my directions" v not listening games.
This brings to mind the ol' "blindfold walk" where students must listen to the one giving the 'right' instructions to navigate the room, and TUNE OUT those giving the wrong instructions.
Play the Can You Snatch a Pebble from My Hand game as a memory hook for verse 29.
Video of pebble snatching game: http://youtu.be/bd7q5sjiwi0
Hope this helps.
