wealthy—and so would make a good husband for his daughter, but Lord Capulet feels that Juliet is still too young. Indeed, he reminds Paris that Juliet "hath not seen the change of fourteen years."

When Lord Capulet says to Paris, "And too soon marred are those so early made," he means that girls who marry too young grow up too quickly. This observation ironically foreshadows what does happen to Juliet later in the play. She does marry too young, and, arguably because of that hasty marriage, she perishes. Indeed, she commits suicide at the end of the play. The foreshadowing is ironic, and tragically so, because Juliet is "marred," not by marrying Paris when she is too young but by marrying Romeo. If Lord Capulet had allowed Paris to marry Juliet earlier, then perhaps she never would have met, fallen in love with, and married Romeo.

It is thus tragically ironic that Lord Capulet perhaps causes, and at least foreshadows, the tragedy that he is trying to guard against.

Alliteration can be defined as the occurrence of the same letter or sound at the beginning of words that are either adjacent to each other or closely connected.

In this particular excerpt from Romeo and Juliet, we have the alliteration of the consonant m in “marred” and “made.” The two words start with the same letter because they are closely connected in terms of the message that Lord Capulet wishes to convey to Paris about his daughter. He wants to get the message across that Juliet can just as easily be marred—that is to say, damaged—by getting married at such an early age, as made—that is to say, made happy.

Lord Capulet drives home his point to Paris by way of another literary device, that of a metaphor. A metaphor can be defined as the comparison of two dissimilar things that nonetheless have something in common.

In this particular case, Capulet compares his daughter to something that's not quite ripe, such as a piece of fruit. Of course, Juliet isn't literally a piece of fruit or anything else in the natural world that isn't ripe, but she's like one in that she's not quite ripe for marriage just yet, whatever Paris might think.

Shakespeare uses both the literary devices of alliteration and metaphor in this passage. In alliteration, a consonant is repeated to create a sense of rhythm and to place emphasis on certain words in a line: here the "m" sound is repeated in "marred" and "made." The context of this line, spoken by Juliet's father, is that Paris is pressing Lord Capulet to allow Paris to marry Juliet. Her father is understandably concerned that Juliet is not quite fourteen and thus too young to marry. Paris responds by saying that thirteen is not too young and girls younger than Juliet have been "made" "happy" mothers. Capulet worries that, as a young bride, Juliet is as likely to be marred or damaged as made happy: the use of the "m" sounds emphasizes that marriage is a double-edged sword that can either "mar" or "make" a young girl.

We could also interpret her father's language as metaphor that likens Juliet to an object (such as a fruit) that still needs to ripen. The word "mar" in this context also brings to mind the idea that Juliet, like a piece of merchandise being bartered over, might be bruised or ruined if mishandled. This metaphor clearly objectifies Juliet by comparing her to an inanimate object that may be enjoyed or ruined by men. 

In Act I, Scene II of Romeo and Juliet, Paris approaches Lord Capulet about the idea of marrying Juliet. Lord Capulet appears to be genuinely concerned about his daughter’s age when it comes to the idea of marriage (Act I, Scene II):

My child is yet a stranger in the world;

She hath not seen the change of fourteen years,

Let two more summers wither in their pride,

Ere we may think her ripe to be a bride.

In other words, since Juliet is only 14-years-old, Capulet believes that she should not marry Paris. He insists that Paris wait two more years. Paris, on the other hand, responds by saying, “Younger than she are happy mothers made” (Act I, Scene II). He is trying to convince Capulet that Juliet’s age shouldn’t matter since other girls that are younger than Juliet get married and have children.

Quickly, Lord Capulet responds, “And too soon marr’d are those so early made” (Act I, Scene II). Here, Shakespeare is using a pun on words: marr’d and married. The subject of their conversation is marriage, but Lord Capulet uses the word “marr’d,” meaning to spoil or ruin something. The phrase in its entirety is a symbol for Juliet’s age. Capulet believes that if Juliet gets married too young, she will be spoiled or ruined.