I contacted the makers of the Silent Subliminals, and they advised that one should always refer to oneself in the 1st person when saying affirmations.Here's what they said
Always speak to yourself in the first person (with GUSTO)..... just as you have been speaking to yourself since the day you were born!! "I will achieve this goal by the end of this month! I will.....!!"

Your cerebral cortex loves to hear you own voice just as it always has. It easily accepts commands and thoughts in its own voice.

Have a good day...
Dr. W......