Why we should use words carefully?

Some people say I was tickled to death. What effect will that produce?

The reason they say that is because it is a lens reflection of a past incarnation. Spoken often, repeated as a form of speech and with each utterance is more plainly imprinted upon the brain. Oh, I was just tickled to death! 

Come to the realisation that words are things to be guarded and spoken only after careful thought, for every word counts to make up the vibration surrounding the aura. Then the phrase I almost died is another bad impression to put into words. Every expression makes it more plain and gives it more power. Its reflection upon the mental sometimes causes a great confusion, often a terrible sickness. Yet we do not trace to that source the trouble which sometimes comes upon us. The phrase I nearly dropped dead is another of the same dangerous class and causes heart failure for the mind controls the heart. The word guess is bad also. It has a decided lack of determination. One must be positive and say I do not have that idea or It is not the most favourable, something similar, but more positive.