In order for you to answer this question correctly, please use the following excerpt down below:

We know it well that none of us acting alone can achieve success.
We must, therefore, act together as a united people, for national reconciliation, for nation-building, for the birth of a new world.
Let there be justice for all.
Let there be peace for all.
Let there be work, bread, water, and salt for all.
Let each know that for each the body, the mind, and the soul have been freed to fulfill themselves.
Never, never and never again shall it be that this beautiful land will again experience the oppression of one by another and suffer the indignity of being the skunk of the world.
Let freedom reign.
The sun shall never set on so glorious a human achievement!
God bless Africa!
Thank you.

According to Mandela, what work does the nation still need to do? Identify a specific piece of evidence.