Ignorant people have nothing to fear. What is really sad is that an ignorant person doesn't care.

1, which means: He who knows nothing is not afraid of anything. 2. Source: Confucius said: "A gentleman has three fears: fear of fate, fear of adults, and fear of the words of saints. I don't know my fate, but I'm not afraid of it. I am insulting adults and saints. " -"The Analects of Confucius Ji's Article 16" 3. Synonym: Newborn calves are not afraid of tigers. 4. Part of speech: neutral positive example: Helen Keller said: I have never seen this world, so I can draw a more beautiful world. It is precisely because she can't see the world, but her heart is beautiful, so the world is colorful and charming in his heart. Even if you can't see it, you can bravely overcome difficulties and create your own glory. Counterexample: In ancient times, people didn't know that trees were the green lungs of the earth and cut them down blindly. Because they don't know the benefits of forests, desertification is serious in many parts of the earth, which has caused great trouble to future generations.