I think rapid progress in calligraphy has nothing to do with intelligence. Practicing calligraphy mainly requires diligence and seriousness. If you practice one character seriously, it will be much better than if you practice ten characters carelessly. Calligraphy practice is not like math and physics questions that require thinking. You don’t need to think about it. As long as you become smarter just by practicing, it doesn’t matter. It mainly depends on your diligence.