The thirteen barriers of honing human nature: The first barrier, having lofty aspirations and being eager for success. The second barrier, repeatedly fighting and failing, feeling disheartened. The third barrier, falling to rock bottom, feeling isolated and helpless. The fourth barrier, self-denial and self-imposed limitations. The fifth barrier, accepting oneself and rebuilding confidence. The sixth barrier, studying hard and changing oneself. The seventh barrier, continuously trying and achieving small successes. The eighth barrier, avoiding arrogance and impatience, controlling risks. The ninth barrier, seeing through human nature and leveraging it. The tenth barrier, achieving success and wealth rolling in. The eleventh barrier, controlling desires and avoiding mistakes. The twelfth barrier, returning to family and returning to simplicity. The thirteenth barrier, seeing through the mundane world, realizing that all things are empty.