This may be helpful for some in the beginning but it isn't strictly needed. Just like a child not wanting to eat broccoli can make their will known without words so can you.
As for this whole thanking bit you can save your time, watch the Dog Whisperer to get an idea how the universe communicates. It used energy and energy prints to know how you feel about a situation words only get in the way.
It also knows you sins and good deeds this way, there is no need to spell them out.
Since NOTHING can occur without our will to execute they are simply waiting for that...which is what makes cutting everyone off from their guides job #1.
Dowsing is only one part of this; for those on the Doctrine even if your dowsing is being interfered with you can still command and talk to your guides.