A single principle rules the cosmos, individuals and groups. God has given rules and laws to the great All and, to the beings which populate the universe, He has given free will. When one of these laws is infringed, a regulator comes to bring not judgment but hope; his function is to reestablish equilibrium. This is the role of the comets.
These follow a determined circuit in space. They never return by the same path. When one has accomplished its mission, it disappears, and another comes to take up the path the former one has left.
[...] And thus humanity, since that distant day when God sent it into the world, walks by trial and error towards the Father's House. Individually and collectively, in their millennial past, men have received a ray of the true Light. But the earth is constitutionally incapable of conserving the gift which God has given it for long without deforming it; man has the power to stray from the road which had been drawn out for him. Then Divine Mercy sends beings who bring hope; or an exemplar who comes among men to play the role fulfilled by the comets in the cosmos.