For a quote to be meaningful, it has to go beyond being merely clever and point to deeper truths about existence. The same goes for meaningful quotes about love- they have to be more than just some superficial commentary on the usually short-lived pangs of the lust of new romantic love. The quote "If loving you is wrong, I don't want to be right" is not much more than a pop reference to that queasy feeling associated with new love or abusive/ dependent relationships. Contrast this to some of Thich Nhat Hahn's quotes about tending to loved ones as one would lettuce, doing what's necessary to help make it grow. It points to the truth that love is not about having sex with someone, but understanding.
Betty Smith had some wisdom to share when she said to "Look at everything as though you were seeing it either for the first or last time. Then your time on earth will be filled with glory." How many things in our life do we take for granted- how many people? If the quote "familiarity breeds contempt" applies to you, perhaps you should take the advice of Betty. Because nothing is ever the same from moment to moment- that's the nature of reality. You might as well live in it.
I like short meaningful quotes because they're easy to remember, and can be used to get a point across without coming off as pretentious or silly. I've found that the phrase "Use it or lose it" applies to many things in life, from foreign languages we've learned to skills like writing, singing, or playing sports. Ruth Gordon had a more positive, proactive way of putting it. She said that "Courage is like a muscle. We strengthen it with use." While she was talking about mustering up the courage to take on a challenge or face things that make us uneasy, the idea of strengthening things with use is right on, and something to remember if there's something about yourself that you would like to change for the better.
Another one of our famous meaningful quotes comes from Mary Tyler Moore, related to Ruth Gordon's, says that "You can't be brave if you've only had wonderful things happen to you." This is a great truth, especially good for those people who have had to deal with a lot of trials and tribulations in their lives. It is well put by the great Bruce Lee, who has one of the best meaningful quotes of all time that goes "Ask not for a life that is easy, ask for the strength to deal with a hard life" http://hubpages.com/hub/Meaningful-Quotes.