A common hook used for selling something is to offer a guarantee. Of course, the hook might come with some catches like time limits or other restrictions. It's the "money-back" guarantees that are most appealing.

You can also buy extended warranties and some credit cards even offer warranties. But remember, guarantees or warranties are only as good the one who issues it, whether it's a person or a company. Are they trustworthy? Will they stay in business?

Another limitation is whatever is being guaranteed. Any item or service, even a life insurance policy is limited because it's temporary. A life insurance policy is only in force while a person is alive and pays out when they die.

But what about a human soul? It's contained within a physical body but it exists beyond physical life. What kind of guarantee is there for life after death and eternity, or is there any? Again, it depends on who issues the guarantee.