And further, I think words have increased power when combined with emotion. When I wish to receive something, I speak about it with gratitude -- which is the pattern I will create when receiving the thing I want. In that, I see it as making the space for the new thing to come in (picturing tetris blocks here). But I think that works in the inverse as well -- if I speak of what I want with hopelessness, I am creating the pattern which will happen if I do NOT receive the thing I want. Instead of creating the space for it, I am actually blocking it out. Even if I say it enough that the pattern gets created, there may not be space in my life for it to fit in.
In my speech I try to say only what I mean and what I want. I try to use all-positive phrasing -- for instance, "I want to succeed" rather than "I hope I don't screw this up." I try to avoid using epithets of any kind -- saying something like, "wow, I can imagine I'd be really upset if I were you" rather than "so-n-so is a horrible person for doing that to you!" I try to be honest and open. I try to use very specific language and be as clear as I can, rather than using euphemisms and side-statements. In writing I try to phrase things as clearly as I can -- which usually means thinking about what questions might arise from a statement and answering them pre-emptively.
Playing? I don't know if I play with words. I speak in glossolalia sometimes, perhaps that is a way of playing. Otherwise, I consider them to be very sharp knives and I do not consider myself to be skilled enough to be tossing them around. Occasionally I have been careless and it has almost always resulted in significant hurt -- in part because people expect me to mean everything I say (and mean it with passion and forethought!) and if I say something I don't mean, they have no way of realizing that I'm just being careless. That seems so out-of-character that it doesn't even occur to them. Unfortunately sometimes even when I am careful, I phrase things badly and people still assume I meant it the way it sounded to them. But that's a side-effect I'm willing to accept because it happens fairly rarely.
(from this question on formspring)