Watch your words, for they become actions.
Watch your actions, for they become habits.
Watch your habits, for they become your character.
Watch your character, for it becomes your destiny.
Under the guise of being a piece of wisdom, this, to me, sounds like a healthy recipe for going insane. Watch your thoughts? Indeed. Might as well try to bite your own teeth.
The world becomes a lot more fun and easier to deal with once you stop trying to control everything and realise that things tend to work pretty much ok even if you don't keep a paranoid eye on them.
I much prefer the following Haiku:
Sitting silently,
Doing nothing
And the grass grows by itself.