Bhagavad Gita 6.8ज्ञानविज्ञानतृप्तात्मा कूटस्थो विजितेन्द्रियः।युक्त इत्युच्यते योगी समलोष्टाश्मकाञ्चनः ॥

Jnana is ParokshaJnana or theoretical knowledge from the study of the scriptures. Vijnana is Visesha Jnana or Aparoksha Jnana, i.e., direct knowledge of the Self through Selfrealisation (spiritual experience or Anubhava).Kutastha means changeless like the anvil. Various kinds of iron pieces are hammered and shaped on the anvil, but the anvil remains unchanged. Even so the Yogi remains unshaken or unchanged or unaffected though he comes in contact with the senseobjects. So he is called Kutastha. Kutastha is another name of Brahman, the silent witness of the mind. (Cf.V.18VI.18)