What Do You Say?

Students of neurology and kindred disciplines have been telling us for over a century that we speak, not only to tell others what we think, but to tell ourselves what we think. That's not the whole story, but it seems an important part of it. What do you think the lesson here could be. I've thought it might be to take a bit more care about what we say to ourselves. Or,"Think before you speak." That seems actionable.