Answer:
I could not find online the text to which you are referring, but I can get an idea of what it refers to.
If we talk about love, and even more about a marriage that takes place for love, we are talking about something we do of our own free will, without seeking anything in return. It is a union that two people make with the confidence that it will last forever because they love each other, and their only interest is that promise of union that exists between one and the other.
On the other hand, an arranged marriage is usually carried out to obtain something in return and is devoid of love.
There are many religions that parents arrange marriages for their children without giving them a choice. There are other cases where maybe two people decide to get married to get some benefit, even if they are not in love.
Basically, those are the biggest differences between the two concepts.
