Scientist, Dr. Masaru Emoto, did an experiment on the power of words and intentions. He used water as his test subject. This was pertinent because the human body is mostly composed of water.
Dr. Masaru spoke loving words to one glass of water, and hateful words to another. He found that the water that received loving thoughts and words formed beautiful crystals; while the degraded glass of water formed deformed, murky molecules. Dr Masaru discusses the results of his experiment in his book, "The Hidden Messages In Water."