The Duality of Purpose involves two things which seem contradictory at first, but are in fact complimentary.
First, we are called to aspire to love one another in the same was as does the Lord. This means putting ourselves last, and in total service to others. To accomplish this, we must have fully compassionate and open hearts, pure motives, and a clean spirit so that we can recognize and understand the needs of others. We should smile and turn our warm countenances towards these poor souls, with mercy, as the Lord does unto us.
Second, we must also recognize that relationships to things on Earth are ephemeral: people pass away, kids move off to college, churches close, houses burn down, cars get damaged in accidents. Therefore, our happiness can not be based on ephemeral things, because they fade into nothingness. At the worst, they can become a source of great ego and vanity. So what then is the rock upon which we must rest our souls?
Our relationship with the Lord! It must come before all other things. It is the one constant upon which we can always depend. If we truly love the Lord, and unite our hearts with Jesus so that we can constantly be in communication with Him, even in the noisiest periods of our days, only then do we have the strength, the direction, and the will to know how to love others completely.
If we let the Lord shine upon us at all times, then we can face any challenge! Because we will always have that unweathered foundation, which is stronger than diamond or any substance in this universe. This gives us a form of healthy detachment from Earthly things: we can love them deeply and keep them within a Godly perspective at the same time. They compliment because in fact this inspired orientation is not possible in any other way but through unity with Jesus.
This is the Duality of Purpose, as it is being interiorally described to me. It was inspired within me as the culmination of some observations I had at a Pastoral Council meeting, some words spoken to me by the same priest who channeled the Lord during my confession last month, and by prayer to our Holy Father.