Whether we realize it or not we are speaking affirmations every day. What you are affirming is between you and the Holy Spirit so stay mindful of the words we speak out loud and silently to ourselves. Remember that there is an impersonal aspect of the Holy Spirit which is Law, and there is a personal aspect of the Holy Spirit which is Love. Also remember that we don't want to sin against the Holy Spirit because this is the only sin that's not forgiven. Scripture reads "And everyone who speaks a word against the Son of Man will be forgiven; but whosoever blasphemes against the Holy Spirit will not be forgiven. " Luke 12:10
I believe that sins against the Holy Spirit can't be forgiven because of the Law, the Holy Spirit is governor of God's laws, and his laws are consistent, and precise and quite frankly can't be altered, changed or taken back. We must recognize our God given abilities, prayer and meditation is the key. Lets speak our affirmations with wisdom, and let the Holy Spirit have its way!