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That's a sincere intention, right? Not an oath. Anything more 'elaborate' that you're promising or swearing to do, or not to do, comes from your imagination. What do you think you can do, and what circumstances will allow it? It's imagination, it's ignorance. And when you're identified with your ignorance, that's the DEVIL. And YOU give it life! What is this saying, essentially? It's saying, 'don't lie'.That's all it's saying. You want 'God'? Then don't lie. You want the refinement of your own soul? Then don't lie. And you can see, by the various things that are pointed out here - just how you do lie.

taken from: 
The Sermon On The Mount