It cannot have been in order to deceive the King by concealing his love for Ophelia, for such concealment must necessarily undeceive him; the King, Queen, and Polonius are all deluded into believing him mad for Ophelia's love, and this test is expected to confirm them in it; but we know that in fact the King is undeceived, for his comment is: Love!
"The Three Heron's Feathers"
Hermann Sudermann
And let me be honest now, whatever I have been in the past; if I deceived myself and others, let me undeceive myself and you!
"Peccavi"
E. W. Hornung
Don't breathe a word to undeceive him.
"Andy Grant's Pluck"
Horatio Alger