He who does not know one thing knows another – African Proverb
Quote by African Proverb

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When there is no enemy within, the enemies outside cannot hurt you. – African proverb
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The hypothesis may be put forward, to be tested by the s subsequent investigation, that this development has been in large part a matter of the reciprocal interaction of new factual insights and knowledge on the one hand with changes in the theoretical system on the other. – Talcott Parsons
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