Challenge HINT!!!

Hi Gang,
I just wanted to touch base with you all to remind you of the challenge. I thought I'd give you a hint to solving this enigma:

HINT #1:
The two most important commandments ARE NOT an opinion. There is a most important and a second most important commandment (according to someone). So, my challenge to you was to find them, and tie in why you think service is so important to God.

HINT #2:
You won't be able to answer this without opening you Bibles. And unless you have memorized scripture (and a lot of it), you probably won't be able to find the answer without using a concordance, or a Google search.

HINT #3:
Jesus

Hope that helps and that you're up to the challenge. Good Luck!