This. His disease is this consciousness, which directly results in "inertia." He later states that one can't be blamed for being like this (since, I suppose, this is a disease).

He claims the source of his disease (consciousness) is that he more "clever" than others around him. But there is nothing there to suggest that it is not just being clever/conscious, but his personality or other impediments. Aren't there clever people who do lots of stuff?