# show my greatness and my holiness

"show that I am great and holy"

# I will make myself known in the eyes of the many nations

"I will cause many nations to understand who I am"

# know that I am Yahweh

"understand that I am Yahweh, the one true God". Yahweh implies that they will know that he is the one true God who has supreme authority and power. See Ezekiel 6:7.