I noticed it watching Barack Obama's big speech.

The big event. The big night. The big everything, and I'm thinking to myself.

He's here by chance. By chance.

Good chance. But just chance.

Think about it. Had John Kerry not picked him out of nowhere four years ago to speak at the Democratic convention, would he even be at this one?

Or Joe Biden. I wonder if this Georgia-Russia thing had never happened, whether old foreign policy guru Joe becoming running mate Joe would have ever happened.

Or even Alaska Governor Sarah Paylin. Would she be making history today had Hillary Clinton not been passed over about a week ago today?

I doubt it.

Life is like that.

Chance.

Some rise to it, like Obama.

Some like Biden, with barely 9,000 presidential primary votes to his name, luck into it.

It's not good or bad. It just is.

As it always was.

When a talented young debater named Lincoln caught folks' attention in losing a Senate election, only to come back four years later and win a presidential one.

And had John Kennedy not gotten some buzz from almost getting the number two spot on the Democratic ticket in 1956, would he have won it all in 1960?

I doubt it.

I mean it could happen. But I think without these chances, it's harder to happen.

Such is life. Accidental paths. Unexpected turns.

Reminders all that before you seize the day... sometimes, sometimes, history just randomly seizes you.

And then it messes with you.

Just watching what you're going to do now that it has.

Hoping by chance you noticed.

And by chance, you will act.

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.