What does Ezekiel 2:5 mean?

The Spirit entered into me when he spoke to me, and set me on my feet; and I heard him who spoke to me.

He said to me, “Son of man, I send you to the children of Israel, to a nation of rebels who have rebelled against me. They and their fathers have transgressed against me even to this very day.

The children are impudent and stiff-hearted. I am sending you to them, and you shall tell them, ‘Thus says the Lord Yahweh.’

You, son of man, don’t be afraid of them, neither be afraid of their words, though briers and thorns are with you, and you do dwell among scorpions. Don’t be afraid of their words, nor be dismayed at their looks, though they are a rebellious house.

You shall speak my words to them, whether they will hear, or whether they will refuse; for they are most rebellious.

But you, son of man, hear what I tell you. Don’t be rebellious like that rebellious house. Open your mouth, and eat that which I give you.”