I love pickles, including the brand shown here, but here in Colorado we get a local brand that is incredible. I will only reveal the names of both pickle brands if the manufacturers donate generously to the WACIRF*. Regardless, I love pickles and if you do too, you can play along at home. Otherwise you're going to have to come up with your own metaphor.
What do you do with your pickle jar when the pickles are gone? if you're like most modern Americans you either toss the jar away or you dump the "pickle juice" out and recycle the jar. Either way you do it, you're wasting a Valuable Culinary Resource.
When the pickles are gone you have a half of a jar of "Pickle Juice". Think of the things in that liquid: kosher salt, vinegar, dill, garlic, onion, pepper... all potent flavorful ingredients, it's a sin to waste them. My mom was a child of the depression, she and my aunts and uncles were raised by my widower grandfather to believe one important truth: "do not throw good away". Mom always had a jar of pickle juice in the fridge and would get upset if you threw that away. To me a tuna salad sandwich is not worth eating if there wasn't a splash of pickle juice in the mixture. A great salad dressing is simply mayo or Miracle Whip thinned out with pickle juice. And on french fries it's incredible! (not those whimpy fast food fries,steak fries or the big crinkle cut things)
Feeling adventurous? Slice up a cucumber and put it in the left over pickle juice, and put the jar in the back of the fridge for a few weeks. Surprise - you just made pickles.
On to metaphorical territory**: This jar of pickles is the Bible, it contains the word of God. As you eat the pickles; study the bible, learn the lesson in church, you are enjoying his word. Each bite delicious and refreshing and satisfying. And when you finish 'eating' you still have that wonderful juice that you can use to flavor what ever you do. Look at Chick-fil-A, they use that left over juice to flavor their interaction with customers; "Yes ma'am", "Yes sir", genuine smiles, polite conversation, fast service, clean appearance. They aren't preaching the gospel with words but with actions.
In my town here on the edge of the Colorado prairie (I think I'll call it West Woebegone) there is a McDonalds, Chick fil-A, Taco Bell, and Arbys all in a row, and any night of the week except Sunday you can drive right up to the drive-thru microphone and order your Big Mac or Chalupa box or Beef n' Cheddar without a wait, but if you want a chicken sandwich and waffle fries, you're going to wait. The lines to get in to Chic-fil-A go around the block every night Monday through Saturday without fail while there are no lines at any other store.