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"The single greatest factor of affirmation success is in their repetition. When a statement is repeated often enough, it will become accepted as truth and authority. Repetition is how you impress the subconscious mind with a certain thought or suggestion that you wish for it to embrace. Affirmations got to be repeated on a consistent basis until they become your accepted reality. Something is accepted when it has become familiar to your mind."
Source: www.mindreality.com, Speaking Your Intention Gives it More Power