Be genuine.
You can look up poems and quotes about love online or in books, they are always helpful in putting into words feelings and beliefs of love which are otherwise very hard to express. My suggestion, is keep these short. No more than 3-4 lines of a poem, and no more than 2 sentences from a quote. This is your speech, you can support it from other people's speech, but make it yours regardless.
Please please please, don't do the mistake I've seen in the last 4 weddings I've been to. Each one, again I said each and every one, asked their sister to give a speech. And each one gave the "To find a prince you must kiss a lot of frogs... and boy did she kiss a lot of frogs before she found X" speech. Everyone at the wedding knows what this means, it's the subtle (and not always knowingly) way of calling her sister a slut on her wedding day. Don't do it.... ever.
Mention a time in which they proved their commitment to each other, or a time in which one helped carry the other through tough times. Mention how he/she lights up when the other enters the room. Speak genuinely, your point of the speech is to give testimony as a close friend/sibling to how these couple have what it takes to make it these days.
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"Smite the rocks with the rod of knowledge, and fountains of unstinted wealth will gush forth." - Ashbel Smith as he laid the first cornerstone of the University of Texas
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