Funny thing... I remember once stabilizing a dream out on my balcony(training ground)
And the sky seemed to be dark...
"I don't want it to be dark,I'm about to fly and I need some light" I thought...
All I did was look at the sky and shouted out "BLUE!!" and the sky turned blue...
After some time,it turned dark again...and so,I yelled again "BLUE" and it turned blue...
Same thing when I was flying,I was getting quite slow so I shouted out "SPEED" and I flew much faster...
What I'm trying to say is verbal commands are really powerful...Believe and understand them and they'll work...
Sometimes you'll shout things you didn't prepare for...
Hope that helps man...
-Sam