A week ago today.

If media reports are right, last Friday...just seven days ago...Eliot Spitzer was informed the feds were onto him.

The prostitution ring. The phone calls. The secret trysts at a Washington hotel. Everything.

Eliot Spitzer's world was crumbling.

And outside of investigators, he was the only one who knew it.

His wife didn't know.

His kids didn't know.

His closest staffers didn't know.

Within hours, he'd start telling them.

His wife, reportedly a whole 48 hours.

He'd show up the next day at a big Washington dinner.

He was laughing, joking, seemed fine.

Then on Monday, it was over. He was over.

Incredible. Not his sordid story.

But how quickly it was told, and closed.

And a reminder to us all that things change quickly.

Promising careers shot down in a moment.

Unknown ones emerging the very next moment.

Just like that.

I know I'm not saying anything profound, save this profound truth in life.

We live in the moment, but forget it's just the moment.

Taking the results of a single primary, or a single day sell off and discerning some larger, longer, more lasting meaning.

Until the moment changes and it all means something else.

Beware such sweeping predictions. They're made in the moment, until the moment they change.

Watch Neil Cavuto weekdays at 4 p.m. ET on "Your World with Cavuto" and send your comments to cavuto@foxnews.com

Neil Cavuto serves as senior vice president, anchor and managing editor for both FOX News Channel (FNC) and FOX Business Network (FBN). He is anchor of FNC's Your World with Cavuto - the number one rated cable news program for the 4 p.m. timeslot - as well as the FNC Saturday show Cavuto on Business. He also hosts Cavuto on FBN weeknights at 8 p.m. In addition to anchoring daily programs and breaking news specials on FNC and FBN, Cavuto oversees business news content for both networks and FNC's weekend business shows, including Bulls & Bears, Forbes on Fox, and Cashin' In. Click here for more on Neil Cavuto.