Act 3, Scene 1 Which of his words have revealed to Claudius that Hamlet is not mad?

From the text:

Love? His affections do not that way tend. Nor what he spake, though it lacked form a little, Was not like madness. There’s something in his soul O'er which his melancholy sits on brood, And I do doubt the hatch and the disclose Will be some danger—which for to prevent, I have in quick determination Thus set it down: he shall with speed to England.