The final sentence is key: Unless we take our innate biases into account, the blessing of human reason can easily become a curse. So take your innate biases i

The final sentence is key: Unless we take our innate biases into account, the blessing of human reason can easily become a curse. So take your innate biases into account. Familiarise yourself with them. Read books like "Predictably Irrational". Follow Eliezer Yudkowsky most excellent articles on http://www.overcomingbias.com/ http://www.overcomingbias.com/ (and read his awesome "Harry Potter and the Methods of Rationality" at http://www.fanfiction.net/s/5782108/1/Harry_Potter_and_the_Methods_of_Rationality http://www.fanfiction.net/s/5782108/1/Harry_Potter_and_the_M... ). Be aware of those biases. Your subconscious has biases too. Don't take its answers for granted - test them out. Practice figuring out what your subconscious is biased about, and correct for that. Being a rational thinker is not about explaining/rationalising your conclusions, it's about using subconscious and conscious reasoning in tandem, being aware of the shortcomings of both, and building up to valid conclusions based on whatever evidence you can get your hands on (and acquiring more evidence where useful).