LOL, this made me choke. Terry, you have to do analogy on, Works, but that might be too simple.
WORKS is an interesting subject!
(Matthew 22:35-40):
Then one of them, a lawyer, asked Him a question, testing Him, and saying, "Teacher, which is the greatest commandment in the law?" Jesus said to him: "'You shall love the Lord your God with all your heart, with all your soul, and with all your mind'. This is the first and great commandment. And the second is like it: 'You shall love your neighbor as yourself.' On these two commandments hang all the Law and the Prophets."
Presumably, the manifestation of "love" would take the following form (enumerated in the Book of Tobit)
To feed the hungry
To give drink to the thirsty.
To shelter the homeless.
To clothe the naked.
To visit and ransom the captive, (prisoners).
To visit the sick.
To bury the dead.
In Israel, there was only "works" as demonstration of faithfulness and righteousness (after forgiveness). If you didn't offer your sacrifice when and where it was legally required you would not be forgiven and would not officially be considered righteous.
Legal transaction=works.
However, under the Christian non-legal arrangement, FAITH automatically produced WORKS--but, not as the TRANSACTION (give to get) israel covenanted for.
I would use the following analogy...(yes, here it comes!)
If you love a beautiful, sexy wife the works would be sex with her. This in contrast to a mere transaction with a stranger (prostitute) in which you paid and she performed.
Christian "works" is not give-to-get; it is the natural consequence of admiration, respect, commitment and attraction.
So, GRACE cannot be viewed as something humans transact for.
The contradiction comes subtly. BELIEVING IN, PROFESSING and FOLLOWING Jesus is required. It is evidenced by behavior. Behavior=works.
Boing! Game over.