Answer:
The best way to answer this question is by quoting what the characters say or explaining their characterizations.
1. Everyone has troubles: Dr. Gibbs
According to Dr. Gibbs "They'll have a lot of troubles, I suppose, but that's none of our business. Everybody has a right to their own troubles."
2. All people were meant to get married: Mrs. Gibbs
Mrs. Gibbs is portrayed as a typical housewife whose only duty is to be a good wife and mother. She cleans the house, takes care of the kids and leads a simple life.
3. Gives George the advice his own father gave him on marriage: Mr. Webb
In the following passage, Mr. Webb gives George the advice:
George, I was thinking the other night of some advice my father gave me when I got married. Charles, he said, Charles, start out early showing who's boss, he said. Best thing to do is to give an order, even if it don't make sense; just so she'll learn to obey. And he said: if anything about your wife irritates you…her conversation, or anything…just get up and leave the house. That'll make it clear to her, he said. And, oh, yes! he said never, never let your wife know how much money you have, never."
4. laments that girls are unprepared for marriage: Mrs. Webb
Mrs. Webb states "It came over me at breakfast this morning; there was Emily eating her breakfast as she's done for seventeen years and now she's going off to eat it in someone else's house. Oh, I've got to say it: you know, there's something downright cruel about sending our girls out into marriage this way. I hope some of her girl friends have told her a thing or two. It's cruel, I know, but I couldn't bring myself to say anything. I went into it blind as a bat myself."
5. expresses the need for love: Emily
Emily is a romantic idealist that accepts being a submissive wife just because she needs to feel that George loves her. She even represses her feelings for this.
6. expresses the search for happiness: Mrs. Soames
Mrs. Soames constantly looks for happiness, for example, she remembers how happy she was at Emily´s lovely wedding, she thinks that Emily and George are a great couple, and she agrees with dead Emily that people do not enjoy life.