Many stores have the words "Satisfaction Guaranteed" in their store policies. You buy something in their store, and if it doesn't meet your expectations, and you aren't satisfied, you can return it for a full refund or exchange it for something else. My husband and I buy at several stores that have this policy, and have, on occasion, had to use it. But, we only use it if a product doesn't stand up to the promises, or is defective. I am sure many people probably abuse the policy, though.
As a person, we have that same policy with the Lord. We were made free agents, free to accept or reject His offer of FREE GRACE by faith for salvation. And, for that, we are guaranteed an eternal abode with him. But, we have to be willing to obey His commandments. We can decide not to follow His ways, and back out of the agreement. But there is no guarantee that God will strive with man forever. Unlike the store policies, we can't constantly keep breaking His commandments, taking back our worldly ways, and expect a ?full return?. If we would only fully trust God completely, when we accept His offer, then there would always be 'satisfaction guaranteed?!