If leader can’t see her vision, her team won’t be inspired by it.
If a candidate isn’t keen on joining a company, he most likely won’t clear the interview.
If a salesperson doesn’t believe in the product they sell, unless they are peddling drugs, they are not going to sell very much of it.
As Zig Ziglar often said, selling is a transference of feeling. To be able to sell something, you need to first be able to feel it in your bones.