Begin class with a discussion on Valentines day. Ask the class what it's all about, allow them to give answers. 

Sings some songs about love, mix them in throughout the class time.
Songs you could use include:
Jesus Loves Me
Jesus Loves the Little Children
Oh How I Love Jesus
His Banner Over Me is Love
I Could Sing of Your Love Forever
This is My Commandment

Discuss with the children what love is using this verse below.

1 Corinthians 13:13
Love is patient, love is kind. It does not envy, it does not boast, it is not proud. It is not rude, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. Love does not delight in evil but rejoices with the truth. It always protects, always trusts, always hopes, always perseveres.

Love never fails .... And now these three remain: faith, hope and love. But the greatest of these is love. (NIV)

Discussion Questions:
How do you know when someone loves you?
How do you feel when someone loves you?
How do you show others that you love them?
Discuss the meanings of each characteristic of love and what it is not that are listed in the verse.

Continue with this conversation as long as the children remain interested.

Take some time to do a Christian Valentines craft.

1 John 3:16
This is how we know what love is: Jesus Christ laid down his life for us. And we ought to lay down our lives for our brothers. (NIV)

Spend some time talking about Jesus; how he loves each of us.
Use this verse to talk about the Gospel (death, burial and resurrection) of Jesus.

MEMORY VERSE:

1 John 3:18
Dear children, let us not love with words or tongue but with actions and in truth. (NIV)

Talk about the meaning then do a memorization game.

Have a Valentine's day party for the last half of class or just have some Valentine refreshments near the end of class.