Have you heard of the mental law of substitution? When an unhappy idea comes to mind, replace it with a good thought.
If concern about lack and limitation enters your mind, exchange it for the thought that God is your unlimited source of good. When false ideas of illness and disease appear, instead of dwelling upon them, give thanks that God’s life is now being expressed in and through your body. Should thoughts of resentment or hate come to mind, dispel them with the truth that God is within the other person and within you—and where God is present, only love will be expressed.
These are but a few examples of areas in which the law of substitution can be applied. Practice this principle in your daily life, because taking control of your thoughts is the key to your destiny.