There are all kinds of poems and email fwds going around about friendship. A lot of them involve sappy sisterhood proclamations and frankly, few of them speak to how your friendship can help - or hinder - the the planning of your wedding. I found some old-timey quotes that do the trick much better:

A friend is a person with whom I may be sincere. Before him, I may think aloud. -- Ralph Waldo Emerson

Love this one. From bathroom gossip, to "yes those chinos do kind of make your hips look puffy", being able to say what's on your mind is the #1 test of a true friendship. Especially when its something your friend doesn't want to hear.

When a friend speaks to me, whatever he says is interesting. -- Jean Renoir

This is also a goodie. People I find boring could be telling me tomorrow's winning lottery numbers and I'd tune out. My best friend, however, can describe her walk to the mailbox in ways that have me crying with laughter.

One friend in a lifetime is much; two are many; three are hardly possible. Friendship needs a certain parallelism of life, a community of thought, a rivalry of aim. -- Henry Brooks Adams, U.S. historian.

Some may disagree, but I subscribe to this definition of friendship. I think it's good to rarely bestow the title of "good friend" to people. It keeps it from being diluted. I have about 2-3 really close friends, the rest are very fun people I like talking to and having a beer with.

Do not use a hatchet to remove a fly from your friend's forehead. -- Chinese proverb.

Or hands with makeup on them, to adjust your friend's diamond-white veil.

Even a friend may sell you a cracked pot. -- Chinese proverb.

Ha! God bless the Chinese proverb. Succinct and true and unintentionally (?) funny. I'm going to ignore the shady undertones of this proverb and instead say that sometimes friends will unintentionally (?) lead you astray. Always keep your eyes open, even with the best of friendships.

A friend to all is a friend to none. -- 18th century English proverb, collected in Thomas Fuller, Gnomologia

It's not cool that you are friends with my fiance's psycho ex. It's just not. Sorry.

A friend in power is a friend lost. -- Henry Brooks Adams, U.S. historian.

I think the 'bridezilla' in all of us can understand this one. Don't let your bride-dom ruin your cool-dom.

A peck of grain can make a friend; a bushel of grain can make a foe. -- Chinese proverb.

Okay, I'm crying uncle. You got me on this one. First person who can email me a clear explanation of this proverb wins a bushel of grain.

A friend may well be reckoned the masterpiece of Nature. -- Ralph Waldo Emerson

Right on. Think of the amazing stuff that you've done or that has been done for you, in the name of friendship. People carry babies to term for each other. Sometimes they even voluntarily help each other move! Up stairs and everything!