Are there obstacles to your action? If you failed to reckon with the possibility, then that would harm you, as a rational being. But if you use common sense, you haven’t been harmed or even obstructed. No one can obstruct the operations of the mind. Nothing can get at them—not fire or steel, not tyrants, not abuse—nothing.
Meditations 8.41
How many times have I read and reread and re-reread Meditations? Why have I not seen that before? FFS someone (!) highlighted the text in my copy of the book yet for some reason I am reading this for the first time.