August 1966

"You most likely figure, since you're so popular, that you can afford to hire new artists to lessen the strain on your old artists. The trouble is that only very few of these new artists have come up to standards expected of Marvel.
What's wrong with Kirby, your best? Now he only draws two comics completely, and helps out on a couple of others. He probably could easily do another mag or two."

From Amazing Spider-Man, Vol. 1, No. 39