The struggle we have …

“The struggle we have with a holy God is rooted in the conflict between God’s righteousness and our unrighteousness. He is just, and we are unjust. This tension creates fear, hostility, and anger within us toward God. The unjust person does not desire the company of a just judge. We become fugitives, fleeing from the presence of the One whose glory can blind us and whose justice can condemn us. We are at war with Him unless or until we are justified. Only the justified person can be comfortable in the presence of a holy God.”
– from p.180 of “The Holiness of God” by R. C. Sproul.

God is the ultimate object of …

“God is the ultimate object of our xenophobia. He is the ultimate stranger. He is the ultimate foreigner. He is holy, and we are not.
We fear God because He is holy. Our fear is not the healthy fear that the Bible encourages us to have. Our fear is a servile fear, a fear born of dread. God is too great for us; He is too awesomr. He makes difficult demands on us. He is the Mysterious Stranger who threatens our security. In His presence we quake and tremble. Meeting Him personally may be our greatest trauma.”
– from p.56 of “The Holiness of God” by R. C. Sproul.