Identify the doctrine (seeing an object lesson):
Show the children two glasses, one with dirty water and one with clean water. Ask the children which one they would rather drink and why. Tell the children that our minds are like the glasses, and we should put only clean and good things in them.
Write the following sentence on the board, and have the children say it with you: “Reading, watching, and listening to wholesome things keeps my mind clean.”
Consider teaching the children simple hand actions to help them remember the sentence. For example,

• for the word reading, put your hands out like you are holding a book;
• for the word watching, point to your eye;
• for listening, cup your hand around your ear;
• for mind, point to your forehead.

Repeat the sentence several times, substituting the actions for the words.

Encourage understanding (playing a game and singing a song):
Show the children a picture of Jesus Christ with children, and ask them to look at it for a few seconds. Cover the picture and ask the children to tell you details they remember about it.
Help the children understand that we remember the things we see. Explain that when we fill our
minds with good things we also think of good things. Show the picture again, and have the children sing “I Feel My Savior’s Love” ( CS, 74–75).
Ask the children to share how the song makes them feel. Explain that listening to good music helps us feel the Spirit and keeps our minds clean.