Early in the play, in act 1, scene 2, the Count Paris approaches Juliet's father, Lord Capulet, wanting to marry her. However, it seems that the two men have had similar conversations before now because Capulet says that he can only answer by
saying o'er what I have said before.
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. (1.2.7-11)
In other words, Lord Capulet feels that Juliet is still too young—she is only thirteen years old—to get married. He asks Paris to give her two more years to mature and prepare to become a wife and mother.
Paris counters by saying that many girls younger than Juliet have entered into successful marriages and become mothers. Yet Capulet is unmoved, saying that "too soon marred" are those who become mothers so young. He advises Paris, however, to
woo her, . . . get her heart:
My will to her consent is but a part.
And, she agreed, within her scope of choice
Lies my consent and fair according voice. (1.2.16-19)
Capulet tells Paris to endear himself to Juliet in the meantime, because Capulet's permission is only part of what is necessary to marry her: Juliet must consent to the marriage herself. Therefore, Capulet advises Paris to win Juliet's heart.