Doubt and skepticism are the opposite of belief. A sales professional's job is to cancel a prospect's doubt and replace it with belief. If the prospect doesn't express doubt, look out. There's a brain working and an ethical system behind skepticism. Keep in mind that skepticism is the launching pad for belief. Belief is contagious. Remove your own skepticism about your company and the product or service you sell. The more fervently you believe, the better your chances of converting others.