I guess I might have a flaw or two,
And I’ll reveal one if I do.
No one is perfect, not even I.
That, all who know me will deny. 
They all laud me with acclaim and awe;
Not one would concede that I have a flaw.
But, as all folks are fallible, that should include even me, as well.
I’ll scour my mind, on the slim chance I'll find  
a failing I can tell.  
…Wait! I did think of one to which all must agree. 
My single flaw is my modesty.