natural love: This sort of love is had when appetite or desire does not follow upon an apprehension on the part of the very subject that has the appetite, but instead follows upon an apprehension on the part of another. The appetite in this case is called natural appetite, because "natural things seek what is suitable to (convenit) them by their natures--not through their own apprehension but through the apprehension of the one who institutes their nature." Love is "the principle [or source] of the movement of the thing that tends toward the loved end," and in natural appetite this principle is the "connaturality (connaturalitas) of the thing that has the appetite with respect to the end which is loved.