通过数学比喻生动地表达了情感的深度差异。
"Love can satisfy everything, but only for lovers: as for married couples, besides the heavens for a roof and the green grass for a carpet, they need more of other things." — Balzac
"If a girl wants to marry a rich man, it is not love; wealth is the most insignificant thing, and only love that can endure the pain of separation is true love." — Leo Tolstoy
"Courage is like love; it needs hope to nourish it." — Napoleon
"The difference between friendship and love is this: friendship means two people and the world, but love means two people are the world. In friendship, one plus one equals two; in love, one plus one is one." — Tagore
"Flowers are not fragrant without sunlight, and life is not sweet without love." — MSR
所谓爱情能够满足一切，只是对于情侣而言：至于夫妇，除了以苍穹为屋顶和以绿茵地毯之处，还需要更多的一些东西的。——巴尔扎克
如果一个姑娘想嫁富翁，那就不是爱情，财产是最无足轻重的东西，只有经得起别离的痛苦才是真正的爱情。——列夫·托尔斯泰
勇气如爱情，需要希望来滋养。——拿破仑
友谊和爱情之间的区别在于：友谊意味着两个人和世界，然而爱情意味着两个人就是世界。在友谊中一加一等于二;在爱情中一加一还是一。——泰戈尔
没有阳光花儿不香，没有爱情生活不甜。——MSR