In the matter of the Lower Hey in the Eynaim (eyes), it means that a Masach (screen) and a cover was placed over the eyes. Eyes mean seeing and Providence, when one sees hidden Providence.
Experimenting means that one cannot decide either way, that he cannot clarify the Creator’s will and his Rav’s intention. Although one can work devotedly, one cannot decide if this work in devotion is in its place or, to the contrary, that this hard work will be against his Rav’s view and the Creator’s view.
And to determine, one chooses that which adds labor. This means that one should work according to the line that labor is all that is for one to do, and nothing else. Thus, one has no place to doubt one’s actions and thoughts and words, but must always increase labor.