श्री भगवानुवाच इदं तु ते गुह्यतमं प्रवक्ष्याम्यनसूयवे।ज्ञानं विज्ञानसहितं यज्ज्ञात्वा मोक्ष्यसेऽशुभात् ॥

Idam (this) alludes to knowledge of the Self.Jnana Theoretical knowledge of Brahman through the study of the Upanishads, also known as Paroksha Brahma Jnana.Vijnana Direct intuitive perception of Brahman or AtmaSakshatkara, also known as Aparoksha Brahma Jnana.This alone forms the direct means of attaining to liberation from evil or the bondage of Samsara, freedom from birth and death.The knowledge of the Self is the most profound secret. It can hardly be described in words. It can be realised only through direct experience or spiritual intuition. Atman or Brahman or the selfluminous, eternal, Supreme Purusha is ever shining in the chambers of the hearts of men. Throughout the ages there have always been a few who have trodden the spiritual path and found out this secret or the spiritual treasure of the precious pearl of the Self. Knowledge of the Self is the only direct means for attaining liberation, Karma Yoga purifies the heart and leads to the dawn of the knowledge of the Self.Lord Krishna says, O Arjuna, I shall teach you this profoundest secret knowledge combined with realisation as you are free from jealousy. From this we can clearly understand that freedom from jealousy is an important qualification for an aspirant. Knowledge can only dawn in a mind which is free from all forms of jealousy which causes great distraction of the mind and produces intense heartburning