The foundation of irreligious criticism is: Man makes religion, religion does not make man. Religion is, indeed, the self-consciousness and self-esteem of man who has either not yet won through to himself, or has already lost himself again. But man is no abstract being squatting outside the world. Man is the world of man – state, society. This state and this society produce religion, which is an inverted consciousness of the world, because they are an inverted world...Religious suffering is, at one and the same time, the expression of real suffering and a protest against real suffering. Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people.The abolition of religion as the illusory happiness of the people is the demand for their real happiness. To call on them to give up their illusions about their condition is to call on them to give up a condition that requires illusions. The criticism of religion is, therefore, in embryo, the criticism of that vale of tears of which religion is the halo.Criticism has plucked the imaginary flowers on the chain not in order that man shall continue to bear that chain without fantasy or consolation, but so that he shall throw off the chain and pluck the living flower. The criticism of religion disillusions man, so that he will think, act, and fashion his reality like a man who has discarded his illusions and regained his senses, so that he will move around himself as his own true Sun. Religion is only the illusory Sun which revolves around man as long as he does not revolve around himself.
When I became convinced that the Universe is natural – that all the ghosts and gods are myths, there entered into my brain, into my soul, into every drop of my blood, the sense, the feeling, the joy of freedom. The walls of my prison crumbled and fell, the dungeon was flooded with light and all the bolts, and bars, and manacles became dust. I was no longer a servant, a serf or a slave. There was for me no master in all the wide world -- not even in infinite space. I was free -- free to think, to express my thoughts -- free to live to my own ideal -- free to live for myself and those I loved -- free to use all my faculties, all my senses -- free to spread imagination's wings -- free to investigate, to guess and dream and hope -- free to judge and determine for myself -- free to reject all ignorant and cruel creeds, all the "inspired" books that savages have produced, and all the barbarous legends of the past -- free from popes and priests -- free from all the "called" and "set apart" -- free from sanctified mistakes and holy lies -- free from the fear of eternal pain -- free from the winged monsters of the night -- free from devils, ghosts and gods. For the first time I was free. There were no prohibited places in all the realms of thought -- no air, no space, where fancy could not spread her painted wings -- no chains for my limbs -- no lashes for my back -- no fires for my flesh -- no master's frown or threat – no following another's steps -- no need to bow, or cringe, or crawl, or utter lying words. I was free. I stood erect and fearlessly, joyously, faced all worlds.And then my heart was filled with gratitude, with thankfulness, and went out in love to all the heroes, the thinkers who gave their lives for the liberty of hand and brain -- for the freedom of labor and thought -- to those who fell on the fierce fields of war, to those who died in dungeons bound with chains -- to those who proudly mounted scaffold's stairs -- to those whose bones were crushed, whose flesh was scarred and torn -- to those by fire consumed -- to all the wise, the good, the brave of every land, whose thoughts and deeds have given freedom to the sons of men. And then I vowed to grasp the torch that they had held, and hold it high, that light might conquer darkness still.