What tone is established in this excerpt?

“And Vishnusharman made answer to the king: ‘O King, listen. Here is the plain truth. I am not the man to sell good learning for a hundred land-grants. But if I do not, in six months’ time, make the boys acquainted with the art of intelligent living, I will give up my own name. Let us cut the matter short. Listen to my lion-roar. My boasting arises from no greed for cash. Besides, I have no use for money; I am eighty years old, and all the objects of sensual desire have lost their charm. But in order that your request may be granted, I will show a sporting spirit in reference to artistic matters. Make a note of the date. If I fail to render your sons, in six months' time, incomparable masters of the art of intelligent living, then His Majesty is at liberty to show me His Majestic bare bottom.’”