What does Daniel 10:13 mean?

Behold, a hand touched me, which set me on my knees and on the palms of my hands.

He said to me, Daniel, you greatly beloved man, understand the words that I speak to you, and stand upright; for I have been sent to you, now. When he had spoken this word to me, I stood trembling.

Then he said to me, “Don’t be afraid, Daniel; for from the first day that you set your heart to understand, and to humble yourself before your God, your words were heard. I have come for your words’ sake.

Now I have come to make you understand what will happen to your people in the latter days; for the vision is yet for many days.”

When he had spoken these words to me, I set my face toward the ground, and was mute.

Behold, one in the likeness of the sons of men touched my lips. Then I opened my mouth, and spoke and said to him who stood before me, “My lord, by reason of the vision my sorrows have overtaken me, and I retain no strength.