Look up the rice experiment by Dr Masarru Emoto. It's about the effect of the use of positive and negative words, both written and spoken. In the experiment something as benign as rice, which is covered in water, is profoundly effected by positive and negative words. Some would consider it "supernatural", and some consider it just as natural as a tree growing out of the ground... Remember we are made up of 70% or so of water.