I know you posted this in your other post but it should be highlighted again (IMHO)...
I found this very interesting (although I've heard him describe this before ...just not as well as in this video) that Gregg states that ancient writings (even the bible) prove that we have been praying incorrectly.
When belief (seeing as if it's already done) & feeling (coming from the heart with deep emotion ...again seeing the outcome) ... then prayers are answered!
If you watch this video from the beginning to about 20 minutes in ... you'll see what I mean...or even from 10 minutes to 20 minutes. Pretty powerful stuff...and I've done it before...and realized it...but I was only about 20 yrs old and didn't know myself well enough or have the discipline to control it...lol!