Visuals are always better but...
Media Hero said:
Oh, filmy - I'm surprised you're advocating using exposition to reveal anything. Action is better. And incorporating a physical object that represents the goal is better. Everything else is good, I understand.
Maybe I wasn't clear...
When your characters interact through dialogue, they should be revealing things to each other and thus, to us, the audience...
You simply do not have enough time to reveal EVERYTHING via action... LOL.
For instance... Take TRAINING DAY...
Alonzo meets with other head honchos of the LAPD to discuss his problem i.e., he beat a Russion mobster to death in Las Vegas and now he must deal with them...
The screenwriter didn't show the beating to us, he had the characters discuss it to reveal it to us...
I use this as an example because it's an outstanding example of how to reveal backstory... But you can do the same exact thing to reveal your Protagonist's inner goal...
Not saying it's the only way to do it but it is one of the best... And, I disagree with your take of the physical object to represent the Protagonist's inner goal...
Your Protagonist's action should reveal his or her inner goal but your original question was HOW DO YOU INTRODUCE IT?
Again, in TRAINING DAY, what is Jake's inner goal? It's not a physical object although eventually getting the money away from Alonzo is symbolic of his ACHIEVING his inner goal... The money was his OUTER GOAL, the goal we all as an audience immediately understand...
Jake's INNER goal or NEED was NOT TO BE A DIRTY COP. To stay moral and honest.
Jake's inner goal was finally introduced when Alonzo demands that he kill someone. BAM! That was done through exposition but action obviously led up to it.
We had hints of it earlier in the film i.e., THEME when Alonzo baby steps him into corruption...
filmy