When considering what words to use in the wedding ceremony, two points, I think, are important.

First, there are no required words. As a JP, my job is to sign a document (the license) certifying that two named persons indicated their intention to be married. What words are chosen to express that intention is entirely up to them. Below is the conventional script with which I come equipped. Of course, couples are encouraged to get creative if something different is wanted.

The other point to be kept in mind is that the words really don't matter all that much, as hardly anyone is listening. Weddings are about feelings and milestones, and family and children and beginnings and reunions and mood and tone and images, not words. The marrying parties just want to get through it without embarrassing themselves, the maid is honor is focused on taking the bride's flowers at the right time, Dad can't believe it's happening at all, and Aunt Bertha is worried that her wedding gift is all wrong.

Please feel free to cut, paste and edit however you want.  You may also want to browse the internet for more material. There's plenty out there. 

Good afternoon. We are gathered here today to witness and celebrate the marriage of A and B. The celebrating comes later; now we have the important business of witnessing. What we are witnessing is not the making of a commitment between A and B, but rather the public proclamation of that commitment before you, their dearest friends and family. That makes all of us here more than mere observers: we are all participants. For your participation, and the support that your presence here signifies, A and B are profoundly grateful. And, let me to say to A & B, on behalf of all of us, thank you for picking a great day and a great place, and for allowing all of us to share the joy of this occasion. 

[Here insert readings from others, or remarks from or between the couple.]

A and B, as you stand here, please know that love and loyalty will provide the basis for a great life together. If you observe with vows you make here today, and undertake to be the best and most authentic that you can be, then your home will be a place of joy, and that, quite frankly, is what all of us here want for you.

Are you ready to exchange vows? (Yes)

Do you, A, take B to be your lawful wedded wife? Do you promise to love her and comfort her, honor and keep her, in sickness and in health, in prosperity and in adversity, and, forsaking all others, be faithful to her so long as you shall live? (I do.)

And do you, B, take A to be your lawful wedded husband? Do you promise to love him and comfort him, honor and keep him, in sickness and in health, in prosperity and in adversity, and, forsaking all others, be faithful to him so long as you shall live? (I do.)

A, please place the ring on B's finger, and repeat after me: “B, with this ring, I thee wed, and join my life to yours.” B, please place the ring on A's finger, and repeat after me: “A, with this ring, I thee wed, and join my life to yours.” 

A & B, you have declared, in the presence of your dearest friends and family, your intention to be married.  And with your solemn vows of love, trust and fidelity, you have consecrated your lives and your hearts as one. May you fulfill the promise--and the promises--of this day, and may your life together be blessed with joy. 

And now, with the authority vested in me as Justice of the Peace, I declare that you are [husband and wife] [legally married in the Commonwealth of Massachusetts].  Ladies and gentlemen, may I present (Mr. and Mrs. ___/ A and B C___/ etc.)