Four Defects or Limitations of Human Being

1. Propensity to cheat
2. Can be illusioned
3. Senses have limited capability
4. Can make mistakes

Source: Ishopanishad by Bhahtivedanta Swami Prabhupad

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As one advance spiritually

one’s propensity to cheat decreases,

one could not be illusioned easily,

one’s senses could become more capablye, and

one makes less mistakes.