The so-called Law of Attraction and use of "affirmations" both get a lot of harsh criticism these days, but my experience is that there's something valid about both. It may be something as minor as the fact that life is better if you can be positive instead of dwelling in a world of negativity. Or it may be something as major as creating shifts in physical levels of vibration that put you in sync with similar vibrational patterns and therefore attract more of the same, as stated in basic physics.
Either way, my belief is: What's the harm?
And one of the most effective proponents of positive, affirmative thinking is Louise Hay, who's living proof of what she teaches. If you like this 5-minute clip, I have a couple more of her clips on Quantum Spirit ~ just click on the Louise Hay label below.