RAV KOOK ON PARSHAT SHEMOT PART 1 MOSES HID HIS FACE

"God's angel appeared to [Moses] in the heart of a fire, in the midst of a thorn-bush. ... Moses hid his face, since he was afraid to look at God." (Ex. 3:2,6) During Moses' first prophetic revelation, he covered his face, afraid to look directly at this holy sight. Was his response an appropriate display of awe and reverence? Or did it reflect a flaw in Moses' personality, a sign of unwarranted timidity?