Radhakrishnan accepts three sources of knowledge – sense experience, intellectual cognition (discursive reasoning) and intuitive apprehension. Sense experience acquaints us with the outer characteristics of the external world. We come to know the sensible qualities of the objects. The data yielded by sense experience constitute the subject matter of natural science. Discursive reason or what Radhakrishnan calls logical knowledge depends on analysis and synthesis of the data of perception. He calls logical knowledge indirect and symbolic. We are able to handle and control the objects of nature with such knowledge. Logical knowledge and sense-experience are the means by which we are capable of practical purposes and control over our environment. Though he accepts the two means of knowledge, they fail to reveal the “original integrity of the perceived object”.