认识史表明 ,人类认识发展的本性就是不断解放思想 ,辩证否定前人。把解放思想放在中国古代认识史中去考察 ,人类认识总是不断向更高的阶段发展的 ,因为 ,辩证的否定是人类认识前进的关键———揭示认识的批判性和继承性的统一 ;辩证的否定是人类认识发展中的联系环节———揭示认识的阶段性与连续性的统一的系统性 ;辩证的否定是人类认识创造性活动的杠杆———揭示认识的创造性、前进性 (革命性 )。否定在认识中有极大作用 ,否定就是发展 ,要发展就要敢于否定。只有辩证的否定才能把人类基于实践活动而反映客观世界的认识活动的本质展示出来。因此 ,辩证的否定就是认识发展的本性 ,也是解放思想的认识论基础 The history of knowledge shows that the essence of human development is to constantly emancipate the mind and negate the predecessors dialectically. To put the emancipation of the mind in the history of ancient Chinese understanding to examine, human understanding is always to a higher stage of development, because the dialectical negation of human understanding is the key to progress --- to reveal the unity of understanding and inheritance of the critical ; Dialectical negation is a link in the development of human cognition --- a systematic unity that reveals the phase and continuity of cognition; dialectical negation is the lever of human understanding of creative activity --- revealing the creativeness and progressiveness of cognition Revolutionary). Negation has a great role in understanding, negation is development, and development is dare to be denied. Only the dialectical negation can reveal the essence of human’s cognitive activities that reflect the objective world based on practical activities. Therefore, dialectical negation is the realization of the nature of development and the epistemological basis for emancipating the mind