Besides simple interest, increased knowledge can broaden one's perspective and open one's heart, help one to learn how to make proper judgements, and achieve the "clear-headed thinking" Confucius talked about.
除了興趣之外，知識的增廣可以讓人眼界大開、心胸曠達，學會做正確的判斷，真正地達到孔子所說的「不惑」。