The Gnat and the Bull

by Aesop

A GNAT that had been buzzing around the head of a Bull, at length settling himself down upon his horn, begged his pardon for incommoding him; but if, says he, my weight at all inconveniences you, pray say so, and I will be off in a moment. Oh, never trouble your head about that, says the Bull, for 'tis all one to me whether you go or stay; and, to say the truth, I did not know you were there.

Moral:
The smaller the mind, the greater the conceit.