The Nyayasutras state that one must study the means of correct knowledge and hold discussions with the learned, sincere and unenvious fellow seekers of knowledge state sutras 4.2.47 and 4.2.48. One must, translates Phillips, take into account "consideration of personal character as well as the nature of beliefs held by the opponent", in deciding the nature of one's discussions, according to Nyayasutras. In some cases, asserts the text, it is better to avoid arguing with hostile opponents and use methods of knowledge like "a fence is used to safeguard the growth of seeds".