比较是幸福的最大杀手。如果一定要比较，就拿昨天的自己作为比较对象。
The greatest killer of happiness is comparison. If you must compare， compare yourself to you yesterday
The most beautiful things in life are free.
爱是世间无限的变幻；谎言、仇恨，甚至谋杀，都交织其中。
The role of the infinitely small in nature is infinitely large.
解析：比喻立志用功需要循序渐进。