Everything that happens once can never happen again. But everything that happens twice will surely happen a third time.
四元数的诞生,如同几何、代数、形而上学和诗歌这四位父母的奇特后代。
"Memory is fragile and the space of a single life is brief, passing so quickly that we never get a chance to see the relationship between events."
要快乐,我必须拥有我的书和一片天空。
你必须有一个梦想,这样你才能在早上起床。