It's a powerful and moving poem that speaks to the importance of teaching children about love, justice, and the need to fight for what is right. It is often quoted and anthologized.
Here are the first few lines:
> What do we teach our children?
> What do we tell them to do?
> What do we tell them to be?
> What do we tell them to see?
> What do we tell them to feel?
If you'd like to read the full poem, you can find it online with a simple search.