All things in the world are two. In our minds we are two, good and evil. With our eyes we see two things, things that are fair and things that are ugly…We have the right hand that strikes and makes for evil, and the left hand full of kindness, near the heart. One foot may lead us to an evil way, the other foot may lead us to a good. So are all things two, all two.
– Eagle Chief
Pawnee. Introduction to the Pawnee Songs, in The Indians’ Book, by Natalie Curtis.