The sentence "Forgetting and thinking have the bottom of heart" is related to calligraphy. According to the query of relevant information: This is a calligraphy famous saying, which means that in order for calligraphy works to reach the true state and level, it not only requires the use of skills, but also inner perception and accumulation. "Xinzidi" refers to the connotation and depth of calligraphy works, while "forgetting thoughts" means that calligraphers should transcend the material level when creating, use their imagination and creativity, and constantly pursue a higher artistic realm.