God’s command that cannot be understood with my head?

Although even Israelites didn’t listen to Moses

On account of their despondency and cruel bondage,

The Lord spoke to Moses, saying,

“Go, tell Pharaoh king of Egypt to let the sons of Israel go out of his land” (Exod. 6:9-11).

Moses’ response:

“Behold, the sons of Israel have not listened to me;

how then will Pharaoh listen to me, for I am unskilled in speech?” (v. 12)

If I rely on my own understanding, I cannot obey God’s command.