Logic is the science of the regulative principles of thought and Bhagavan Gautama who founded it, the Nyaya Sastra, defined it as that which illumines all LEARNING , the instrument of all actions and the refuge of all moral ethics analysed for the purpose of knowledge -Pradeepa sarva vidyanam, / Upadhi sarva karmanam / Asraya sarva dharmanam/ Vidyodeshe pareekshtah ,