The terms "unity" and "testimony," which compose the general title of this book, express the ultimate goal and the authentic way of practicing Christian mission, respectively.

The ultimate goal of Divine Economy can only be the unity not only of humans but of the entirety of created existence.

On the other hand, the authentic way to practice this mission cannot be through any aggressive or expansionist behavior from Christians, but rather through the testimony of the faithful, stemming from the abundance of the Eucharistic experience.