Persistence is key in mathematical research; many great results come from looking at the same problem from different angles over and over again.

Automatic processes occur without intention, effort, or awareness, whereas controlled processes require attention and effort.

解释：清澈与浑浊，细微与宏大，短小与绵长，急促与舒缓，哀伤与快乐，刚硬与柔软，迟滞与快速，高昂与低徊，呼出与收缩，周密与疏朗，因此而相互辅助。

最个人的就是最普遍的。