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I think Levin is speaking to the process of science, whereby scientific theories must be falsifiable. This self-correcting process of science (that religion, for example, lacks) results in a catalog of tested theories that provide the most reliable way of seeing nature as it actually is, which for Levin is where the truth lies regardless of our cherished beliefs. Nonetheless, because our senses evolved in a relatively confined natural environment, powered by a three-tiered evolutionarily jury-rigged brain notoriously prone to error, we have to be careful in claiming to have proofs of truth.