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.’”