What, to begin, does Locke mean by “determination”?  On a “causal” reading, for a will W to be determined by X is for X to cause W to be exercised in a particular way. One might say, for example, that fear of the tiger caused Bill to choose to run away from it, and, in one sense, that Bill’s volition to run away from the tiger was determined by his fear of it. On a “teleological” reading, for a will W to be determined by X is for the agent to will the achievement or avoidance of X as a goal. One might say, for example, that the pleasure of eating the cake determined my will in the sense of fixing the content of my volition (as the volition to acquire the pleasure of eating the cake) (see Stuart 2013: 439; LoLordo 2012: 55–56).