It is hard to point at specifics for me...the holistic experience is what has deeply reconfigured my cognitive circuits. Eliezer's essays possess the ability to prompt unconventional thinking and to assess belief systems for what they truly are: primarily biases. These essays have taught me the art of meta-intelligence, rigorous reasoning, and epistemic humility, consistently adhering to the principle that "beliefs are hypotheses to be tested, not treasures to be guarded".