“Reviewing the old and deducing the new makes a teacher.”

Simplified Meaning:

When someone looks back at what they have already learned and uses that understanding to discover new insights, they become like a teacher. Think of it like baking a cake. If you've baked a cake before, you know the basic steps. When you try to bake a new kind of cake, you use what you already know about baking to figure out what you need to do differently. This combination of old knowledge and new ideas helps you learn and grow. Imagine a historian studying past events. They read old documents and books, but at the same time, they might find new ways to understand those events based on new evidence or perspectives. By combining what they knew before with what they discover, they become experts who can teach others. This idea can be useful in everyday life too. For example, if you've learned how to ride a bicycle, you use that experience to try riding a mountain bike on a trail for the first time. You already know the basics of balancing and pedaling, but you learn to handle new challenges like rough terrain. By constantly revisiting what we know and expanding on it, we grow more knowledgeable and capable of teaching and guiding others. This approach can make us better at our jobs, hobbies, and even in our personal growth, helping us learn continuously and stay curious.