Why does Ou Yangxun have so much affection for calligraphy?

Ou Yangxun was clever and diligent, and read several lines at the same time. When he was a teenager, he was proficient in Historical Records, Han Shu, Dong Guan Han Ji, especially calligraphy, almost to the point of obsession. Ou Yangxun's calligraphy was famous in the world as early as the Sui Dynasty, and spread abroad. When I entered the Tang Dynasty, people and books were old and perfect. However, Ou Yangxun himself was not satisfied with his achievements, and he continued to learn and improve. It is said that Ou Yangxun once rode out and happened to see a stone tablet written by Suo Jing, a famous calligrapher in Jin Dynasty. He rode on a horse and watched it carefully for a while before leaving, but just a few steps later, he couldn't help but return to dismount and watch. He boasted many times that he didn't want to leave, so he simply laid a blanket and sat down to ponder over it. Finally, he sat by the monument for three days before leaving. Ou Yangxun finally realized the spirit of Suo Jing's calligraphy pen, so calligraphy became more perfect.