Unity sand reading - help me out with wording

Groom and Bride today you have agreed to share the rest of your lives together as a married couple.

But long before today your parents provided you with a foundation of love and caring which has brought you to this point.

As your parents took their seats, they each poured a layer of sand which represents the basis upon which you will build your lives. - this is where I need rewording

The union you are making is symbolized by these two individual containers of sand; one representing you, Groom, and all that you were, and all that you are, and that you will become.

The other one representing you, Bride, and all that you were, and all that you are, and all that you will become.

As these two containers of sand are poured into a third container, the individual containers of sand will cease to exist but will be joined together as one.

Just as these grains of sand can never be separated and poured again into the individual containers, so will your marriage be.

ETA: bolded where I need the rewording help

Hmm... I'd be more inclined to look for a poem, or a bible passage or something that reflects the spirit of what they are doing, rather than more of a play-by-play of what is happening, since people in the audience understand the concept of unity ceremonies (they've been common for more than a decade now). In that way, it's more about a message you want to deliver to accompany it, IMO.

"A wedding is more than a joining together of two people, it's a joining together of two families. As Bride and Groom's parents have with their love built a foundation for their children's lives, they poured this sand to represent that foundation. And now you will pour this sand together, the grains inseparable, to represent a new foundation; one that's twice as strong as either of your are alone; on which you are building your future, and your own family."

The other option is to put a message into the wedding program that explains what you want to say in more detail... Under the heading "Unity Ceremony", say "A message from the Bride and Groom..." and then you write what you want.

(FYI, we are having a Japanese Shinto San San Kudo unity ceremony, and rather than ask the minister to explain it, we have put an explanation on the wedding program, and the minister can speak from his heart while we're doing it.)

I think I would keep that sentence as is, and add to it. "As your parents took their seats, they each poured a layer of sand... They taught you the power of love, the importance of trust, and the conviction necessary to succeed in this lifelong endeavor." You can personalize that addition to what you feel your parents have taught you guys which you are now bringing to your marriage. It's a nice little homage to the moms and dads.