You have many good qualities and have rendered great service, but you must always remember not to become conceited. You are respected by all, and quite rightly, but this easily leads to conceit. If you become conceited, if you are not modest and cease to exert yourselves, and if you do not respect others, do not respect the cadres and the masses, then you will cease to be heroes and models. There have been such people in the past, and I hope you will not follow their example. "We Must Learn to Do Economic Work" (January 10, 1945), Selected Works, Vol. III, p. 239.

I was going to post quotes from the red book in order, but decided going randomly would be better. Dead sub and all.