"I don't believe anybody can really grasp everything that's even in one textbook"

This quote by Joshua Lederberg talks to the complexity of knowledge and the difficulty of truly comprehending a subject. He is suggesting that it is impossible to fully understand the totality of a textbook, as textbooks are frequently filled with a vast quantity of info. He is implying that textbooks are too complicated to be totally understood, which it is impossible to acquire a total understanding of a subject from a single textbook. This quote speaks to the trouble of knowing and the significance of putting in the time to genuinely understand a topic. It is a pointer that understanding is complicated which it requires time and effort to acquire a detailed understanding of a topic.