July 11, 1608
Regarding the lodestone that I purchased for Prince Cosimo from Sagredo a few months ago: I have devised a plan in which I intend to compare the lodestone to the power of the prince, for whom I shall propose an emblem of a medal.
The body of the impresa shall be globe-shaped with a number of small pieces of iron that surround it. The soul of the impresa will comprise the motto: Vim Facit Amor (Love produces strength.)
Accordingly, the pieces of iron which are inevitably attracted to the lodestone will metaphorically represent Prince Cosimo’s subjects who are inevitably attracted (by love) to their ruler!