Worry is the only emotion that never leaves a human's heart.

In 25 Years, It Won’t Matter.

You’re worried about what-ifs. Well, what if you stopped worrying?

She tried to worry that something terrible had happened to him, but didn't believe it for a moment. Nothing terrible ever happened to him, though she was beginning to think that it was time it damn well did. If nothing terrible happened to him soon maybe she'd do it herself. Now there was an idea.

Worry is stressing about a situation that may or may not occur and it’s always in the negative sense.

Planning is worrying based on facts