יח

And he said, that by him a man and a woman are equal, that is, that no facet of thought occurs to him when he sees a woman, just everything is the same by him in his eyes, as if he sees a man. And one time he said, that he has no fear, not from a woman and not from an angel.

And with this there's a lot to explain, because someone who still has any facet of fear whatsoever from thoughts of women, even if he is chaste in this regard, just that he's not immaculate in the utmost purity, and he still has some fear at all with this, he needs to fear from an angel; but he (Rabbainu) boasted that he has absolutely no fear of this, therefore he has no fear of an angel.

This is slightly alluded to in the words of our Rabbis of blessed memory (Kedushin 81a): "I am flesh, and you are fire - but I am better/stronger than you," which Rav Amram Chasiduh said to the angel, and it is brought down in his words of blessed memory in the Torah-teaching "Tikoo (blast the shofar) - memshalu (dominion)" Torah 1 in the second volume of Likutay Moharan, see there well, and understand.