Some translations set quotations from the Old Testament farther to the right on the page than the rest of the text. The ULB does this with the quoted material in 10:7-8.
The Pharisees wanted to find a way to make Jesus say that it is good to break the law of Moses, so they asked him about divorce. Jesus tells how God originally designed marriage to show that the Pharisees taught wrongly about divorce.
Metaphors are pictures of visible objects that speakers use to explain invisible truths. When Jesus spoke of "the cup which I will drink," he was speaking of the pain he would suffer on the cross as if it were a bitter, poisonous liquid in a cup.
A paradox is a statement that appears to describe something impossible. Jesus uses a paradox when he says, "Whoever wishes to become great among you must be your servant" ([Mark 10:43](./43.md)).