Whether choice is only of possible things?

Objections

Objection 1 : It would seem that choice in not only of possible things. For choice is an act of the will, as stated above (Article [1]). Now there is "a willing of impossibilities" (Ethic. iii, 2). Therefore there is also a choice of impossibilities.
Objection 2 : Further, choice is of things done by us, as stated above (Article [4]). Therefore it matters not, as far as the act of choosing is concerned, whether one choose that which is impossible in itself, or that which is impossible to the chooser. Now it often happens that we are unable to accomplish what we choose: so that this proves to be impossible to us. Therefore choice is of the impossible.
Objection 3 : Further, to try to do a thing is to choose to do it. But the Blessed Benedict says (Regula lxviii) that if the superior command what is impossible, it should be attempted. Therefore choice can be of the impossible.