Quotation from: The Chessmen of Mars

Written by: Edgar Rice Burroughs

"Look not upon the eyes of Luud," warned the kaldane, "or you are
lost."

Within the chamber Gahan saw Tara of Helium in the clutches of a
mighty body, while close to the wall upon the opposite side of
the apartment crouched the hideous, spider-like Luud. Instantly
the king realized the menace to himself and sought to fasten his
eyes upon the eyes of Gahan, and in doing so he was forced to
relax his concentration upon the rykor in whose embraces Tara
struggled, so that almost immediately the girl found herself able
to tear away from the awful, headless thing.