The weapon of criticism cannot, of course, replace criticism by weapons, material force must be overthrown by material force; but theory also becomes a material force as soon as it has gripped the masses. Theory is capable of gripping the masses as soon as it demonstrates ad hominem, and it demonstrates ad hominem as soon as it becomes radical.

https://www.marxists.org/archive/marx/works/1844/df-jahrbucher/law-abs.htm - Marx

To get a better understanding of dialectics and dialectical materialism you can read the CPV’s curriculum of the basic principles of Marxism-Leninism:

https://en.prolewiki.org/wiki/Library:Curriculum_of_the_Basic_Principles_of_Marxism-Leninism_Part_1