"The injection of evolutionary thinking into socialist theory introduced into it the element of inevitability. According to “scientific socialism,” human actions may somewhat retard or accelerate social evolution, but they cannot alter its direction, which depends on objective factors. Thus, for reasons that will be spelled out below, capitalism in time must inexorably yield to socialism. The emotional appeal of this belief is not much different from the religious faith in the will of God, inspiring those who hold it with an unshakable conviction that no matter how many setbacks their cause may suffer, ultimate victory is assured. It would hold especial attraction for intellectuals by promising to replace spontaneous and messy life with a rational order of which they would be the interpreters and mentors. As Marx put it in a celebrated dictum, “The philosophers have only interpreted the world in various ways: the point, however, is to change it.” And who is better qualified to “change” it intelligently than intellectuals? For all its formal commitment to the scientific method, Marxism violated its most basic feature, namely open-mindedness and a willingness to adjust theory to new evidence. (Bertrand Russell called Bolshevism, an offspring of Marxism, a “religion” and spoke of its “habit of militant certainty about objectively doubtful matters.”) It was a rigid doctrine, dismissive of different views. Marx made no secret of his attitude toward those who disagreed with him: criticism, he once wrote, “is not a scalpel but a weapon. Its object is the enemy, [whom] it wishes not to refute but to destroy.” Marxism thus was dogma masquerading as science."
January 1, 1970
https://en.wikiquote.org/wiki/Marxism