Talking

Well now, this is where it can be really frustrating. Our Bonnie can say quite a lot of things, but CHOOSES not to when we want.
It can be quite infuriating to hear from the opposite end of the house all the words and phrases I've been trying to get her to say on demand - she's only saying them because we're not in the room and she thinks nobody is listening. They are such little buggers sometimes.

You can teach Pidge words easily by just repeating them over and over to him in the appropriate context. He will understand and pick it up no problem (these quakers are super clever); but say the words in front of other people? - that may be a different story.
I know these comments are probably not what you wanted to hear...
This doesn't necessarily mean Pidge won't talk when you want at some point. I'm just sharing our personal experience with Bonnie.

Buddy does this too..altho now talks a lot,there were times he would stop talking for a while and to this day,says very little in the presence of other people..the shy act. He does like to perform tricks for treats with anyone who will give him some..some things never change.
One way that's works for me is to get him as heightened as possible. Get really excited,tap your fingers on the counter,eyes wide open,shake your head while delivering a phrase to him.
Getting him wound up,playing with his toys,ringing bells ect works too. Now when I'm wriling him up I'll say "whudda nuts? Your out of your mind" so now he's saying that a little..trying to. Says ah c'mon will ya " when I try to re arrange his toys. He's usually very defensive when working on his cages,but that's a good time to teach him words. He will say " you be a good bird buddy as he lunges for my finger haha..sweet isn't he?
Cloudy rainy days has him perched on his sisal rope,seemingly out of it,but letting off little mumbles and chirps...soft talking works then too,but usually little words or whistles last year he spent 10 days with a couple Meyers parrots. He came home with their little whistles and we've kept him doing it ever since. So we taught him to pop his head up from his chest to point twards the ceiling and whistle. He now does it when I ask him " what does the little chick in the nest do bud?" So I guess that really,ya just have to be in tune with him and notice moments when he's receptive to conversation..because buddy doesn't talk all the time or on command like some parrots do..and in a way it often seems like if he doesn't like it or the way it was delivered,he won't repeat it ! They can be picky about that too.