The essence of knowledge is discovery. Only in a free environment can people have more possibilities for discovery. Therefore, intellectuals are not essentially people who are familiar with ready-made conclusions. Intellectuals have to discover unknown things and suggest what is behind the falsehood. Truth. The purpose of education is to cultivate students' ability to discover and create knowledge. If education stays at forcing students to instill standard answers and "truth", it is fundamentally anti-education. What is the subject of this passage? ['The nature of knowledge.', 'The nature of intellectuals.', 'Cultivation of creativity.', 'Purpose of education.']