How Much Should You Think About Hashem?

"And these words that I command you today should be on your heart..." (Krias Shema)

Is it said here, "And these words," to exclude all other words; ONLY these words should be in your heart... This is the means of arriving at the true love, for these words occupy the mind ("heart") with love of Hashem and leave no space for any other kind of love. -- Praise, My Soul