The kind and humble Stalin would wedgie whoever made this and call them a personality cultists.

Stalin's own library of theoretical and ideological studies was broad and deep. He would not only study Marx, Engels, and Lenin, but would greatly study those who positioned themselves as ideological opposition to Marxism-Leninism. He actively read the writings of Trotsky, Zinoviev, Kamenev, Bukharin, Plekhanov, etc. He made it a point to learn what and how his enemies think to better understand them and how to counter them. He did not simply hedge himself in a corner reading in an incestuous loop only books that served to reinforce his worldview. He went above and beyond what would be expected of an ideological leader and set the example for the rest of us disciples of Marx, Engels, and Lenin should follow.

That is to be well-read in both depth and breadth.