Aparagraph about what motivates him to romeo and juliet to defy their parents?

The Friar also hopes to force the parents to realize how much they love their daughter as they believe her dead. Friar Laurence hopes that when Juliet is "returned to life" Lord and Lady Capulet will be so overjoyed that she is alive that they will be reasonable about her marriage and seek to ameliorate their relationship with the Montagues. He promises Juliet that he will send for Romeo that she may return to Mantua with him when she awakens.
Now, to return to the first interference of Friar Laurence. It is stated by him that the Friar does, indeed, not want the couple to commit mortal sins by having sexual relations outside of marriage However, it also stands to reason and is consistent with his thinking in the second situation that the Friar also hopes that if the chldren of the feuding families marry, then the parents may feel compelled to live amicably for the sake of their children's happiness as well as for that of possible grandchildren. He tells Romeo, One of the contrasts between Friar Lawrence and most of the rest of the city is that he is supposed to be loyal to his parishioners, regardless of which family they are in, etc. He is also protected to a certain extent from the politics of the city because he is of the church, something held sacred by both families.
Because of this, I believe he acts mainly out of a genuine desire to see what is best happen for Romeo and Juliet and without a great deal of concern to the consequences of that union. He is of course also interested in their salvation so he is certainly willing to marry them before they commit a serious sin like fornication, which he must have known they were wont to do! Hope I helped :

So that they can answer other guests and be polite and proper at their own party.