Another quote is "You could never defeat a Duelist with talent!" See here.
In episode 136 of the anime "Battle for the Bronze, Part 2", Kaiba says something similar to both of these quotes (starting at 7:10):
Joey: "You stole my Legendary Sword! Agh! And my attack points!" Kaiba: "That was a third-rate strategy, Wheeler! Just as I suspected. You could never defeat a Duelist with real talent."