Knowledge is of two types, asserts the Maitri Upanishad: subjective and objective.Max Muller, The Upanishads, Part 2, Maitrayana-Brahmana Upanishad, Oxford University Press, page 311 The subjective knowledge is about the external world dependent on the person, the objective knowledge is about the Self and inner, hidden principles of the world. It is the Self of man that comes to know subjective and objective knowledge.
