Your second question, Isn't the fact that we say that one should give up the cultivation of knowledge in conflict with the first six chapters of Gita which deal with cultivation of knowledge? The first six chapters of Bhagavad-gita, this knowledge is to understand Krishna. Other so-called cultivation of knowledge, as practiced by the Mayavadis and jnanis, means how to become one with the Supreme. That kind of cultivation of knowledge is prohibited. Cultivation of knowledge to understand Krishna as He is, that is called Bhakti. Generally mayavadi's mean by "knowledge'' how to become one with the Lord. That is to be avoided.
Letter to Mohanananda, 27 February, 1972