1.) No teleological system can operate in the face of indifference, and rationality is the paradigmatic teleological system. This is the point of Buridan’s ass.
2.) There are times when we confront indifference: we want one Oreo and there are forty to choose from on the tray, we could serve any tennis ball and the bucket is full, a Libet experimenter tells us to flex our wrist whenever we feel like it, etc. If we ask why we chose this as opposed to that, the correct answer is that there was no (conscious) reason. There is no reason why some particular individual as particular individual was chosen.
3.) We know some non-conscious reasons why particular individuals are chosen in the face of indifference. For example, in the face of two equal options, some research shows we will prefer the one on the right hand side, and Kahneman’s heuristics can all be applied any time we see no more reason to go one way or another (Kahneman got famous for noting the times when an unseen reason would have led to a different outcome than the non-conscious heuristic).
Advertisers are exploiting these non-conscious heuristics all the time – tobacco companies discovered many of the things that cognitive science took decades more research to figure out. These heuristics are themselves teleological systems, and they suggest the experimental possibility that teleology goes all the way down. Whether this is true or not has to be separated from the question whether some descriptions of reality are per accidens in a manner that has no sufficient reason. In the room I’m sitting there is (I’m looking around at random) a broom between a fourth staircase riser and a brown object with at least three legs, but I doubt that reality under that description has any sufficient reason, except in the deeply mysterious sense in which God is the per se cause of even per accidens existence.
That last clause suggests that in the face of indifference we demand divinity, which helps to explain the connection drawn between chance and divine action.
4.) All this is to divide freedom of indifference from free rational choice, i.e. free will. Freedom of indifference can never characterize rational choice, or even any teleological system (like the preference of an animal). For that matter, freedom of indifference cannot even characterize a system that gives intelligible outcomes, whether they are intelligible by an absolute or probablilistic law.
5.) The Late-Fransciscan/ Enlightenment theory of the indifference of free will is a contradictio in adjecto. Where there is really indifference there is no rationality, an investigation into choices made in the face of indifference reveals at least some teleological – i.e. non-indifferent – structures, and even the sheerly indifferent and per accidens traces back to a per se cause of being.
6.) If the will cannot be a priori indifferent it is necessarily a priori committed, and that to which it is committed is what we call the heart.
7.) The basic question of human action is therefore whether it is faithful to that to which it is committed a priori, which requires knowing
(a) What X = the heart’s a priori committent
(b) What action is faithful to X.