Bringing a thought from your mind into your mouth takes it from potential to actual. When we say it out loud, the thought becomes engraved in stone. The soul wants to grow, but the body is holding back. That's why you need to articulate ideas in a way that's convincing, to penetrate the idea into the body. We feel greater responsibility to carry through on what we say , much more than on what we think .
Articulation bridges the gap between the demands of the body, and the lofty notions of the soul.
This has practical application in synagogue life. Talk yourself into it. Play your own devil's advocate. I'll work on my project later. The last time you said that, you didn't get to the project in the end.