Based on the source, what kind of intellectual approach is considered detrimental to spiritual progress, and what are its hallmarks?

According to the guidance in Chapter 2, an intellectual approach marked by argumentation, dualism, and cynicism is highly detrimental to spiritual progress. The text warns against having a 'mind for argumentation,' which is linked to an abundance of ignorance and Maya. Its hallmarks include engaging in dualistic explanations, trying to establish your own side while refuting another's, and employing false logic. This mindset is considered unfit for self-knowledge, as it fosters bad thoughts and prevents the purity of self-interest. Sai Baba advises against such 'useless effort,' indicating that true devotion and faith are unattainable through this path.