Intellectual Rubbish

Travel to different countries, Read newspapers from opposing parties, Seek out people you disagree with

Russell suggests that exposure to different perspectives through travel, reading opposing viewpoints, and engaging with people who disagree with you helps reduce dogmatic thinking by showing you alternative ways of seeing things.

It's not limited by time and space

Russell mentions that imaginary arguments have one advantage over actual conversations - they are not subject to the limitations of time and space, meaning you can have these mental debates anytime, anywhere.

Mahatma Gandhi

Russell mentions Gandhi as someone who opposed railways, steamboats, and machinery, and would have liked to undo the industrial revolution. This serves as an example of how to imagine arguments with people holding different views.

Opinions that flatter our self-esteem

Russell warns us to be very wary of opinions that flatter our self-esteem because these opinions make us feel good about ourselves, which can cloud our judgment and prevent us from seeing the truth objectively.