This song is about how dangerous tradition and ritual religious observances can be. They say, "monotony leaves only apathy", which shows that if everyone adheres to a certain standard of feelings and emotion then no one will care anymore; their emotions won't mean anything, and that is "as good as [lying]". When he enters places that worship or maintain those kind of rituals he gets feelings that "are the kind that [he abhors]." And so because of the depressive state that those traditions bring he labels it "Blue Sunday" where everyone does "the same things".
And then to go further he says that those kinds of things actually lead to "dreary souls" and these "deadened men" will only lead "deadened lives".
This song is about how dangerous tradition and ritual religious observances can be. They say, "monotony leaves only apathy", which shows that if everyone adheres to a certain standard of feelings and emotion then no one will care anymore; their emotions won't mean anything, and that is "as good as [lying]". When he enters places that worship or maintain those kind of rituals he gets feelings that "are the kind that [he abhors]." And so because of the depressive state that those traditions bring he labels it "Blue Sunday" where everyone does "the same things". And then to go further he says that those kinds of things actually lead to "dreary souls" and these "deadened men" will only lead "deadened lives".