I am not a supporter of Marxism, but I fully agree with this formulation. Another thing is that opium can sometimes be useful, and its use justified. For example, I envy believers. Indeed, I am 86 years old, I understand that death is close. And it can turn out to be painful, and no less painful are thoughts about the fate of loved ones. How good it would be to believe in the existence of, say, an afterlife, etc. But the mind is given to man in order to control his emotions and not engage in self-deception, belief in miracles.