The conventional wisdom is never rusty. In terms of Don Miguel Ruiz, people are conditioned to pleasing others or their own inner narrator. Covering the voice of knowledge, people are freed from their suffering. It is just amazing regardless how old or how contemporary the wisdom is; it is always alive. That is the eternity that I have seen so far.
The Four Agreements: A Practical Guide to Personal Freedom: A Toltec Wisdom Book by Don Miguel Ruiz
The Mastery of Love: A Practical Guide to the Art of Relationship: A Toltec Wisdom Book by Don Miguel Ruiz
The Voice of Knowledge: A Practical Guide to Inner Peace by Don Miguel Ruiz and Janet Mills
The Five Levels of Attachment: Toltec Wisdom for the Modern World by don Miguel Ruiz Jr. and don Miguel Ruiz