‘Moreover he said to me, “Son of man, all my words that I shall speak to you, receive in your heart and hear with your ears, and go, get you to the captivity, to the children of your people, and speak to them and tell them, ‘Thus says the Lord Yahweh', whether they will hear, or whether they will forbear.” '
Again there is the stress on the fact that he is going in the name of the Lord Yahweh, and with words he has received from Him. We can only truly be strong when we go with His words. He must receive those words in his heart so that they become a part of him, and hear them with his ears so that he himself responds to them.
So firstly he was again told that he must receive and absorb God's words. Then that he must go to those who were in captivity with him in Babylonia, declaring those words with a ‘thus says the Lord Yahweh'. And he must do it whether they would listen or not.
All these words were spoken following the vision, possibly with silent periods in between as he strove to come to grips with the vision and with the scroll he had seen. God was building up his ability to continue against all the odds, and hardening him to face the inevitable.