For starters, this seems more like emptying your mind than really filling it with godly thoughts. It also runs counter to Matthew 6:7 "And when you are praying, do not use meaningless repitition as the Gentiles do, for they suppose that they will be heard for their many words." But also, this proposed concept of prayer is dangerous in that it can lead to creating false images of God. In Packer's "Knowing God," he talks about how the 2nd Commandment does not only prohibit making physical false images, but also imagining them in your head. "How often do we hear this sort of thing 'I like to think of God as the Great Architect (or, Mathematician; or, Artist).'...We know from experience how often remarks of this kind serve as a prelude to a denial of something that the Bible tells us about God." It seems that Kierkegaard is also suggesting that extra-biblical revelation is possible if we just listen for it.

When we concentrate on only a particular phrase or mantra about God, we can create a distorted image of God in our minds that leads to worship of a false God. That's not to say that we shouldn't meditate on God's different attributes, but we must do so in a way that doesn't focus on one or two, to the exclusion of others. This is also similar to a Roman Catholic using a crucifix to help focus their prayer, which leads to a distorted image of Christ, and eventually causes the prayer to be directed at the object, and not Christ himself.

The problem with this prayer exercise is that it denies a very important truth: The total corruption and sinfulness of man, still present in the life of a Christian.

The above instruction tells you to "listen" to yourself, namely anything that will help you focus on God. This is satanic. The Christian should never be quick to trust the impulses of his heart. It is deceitful above all else (Jer. 17:9). Moreover, the Christian can't even trust his mind to have pure and accurate judgement, concerning knowing God (Rom. 1:21). Instead, he should make every effort to meditate his mind on scripture, which is able to judge the thoughts and intentions of the heart (Heb 4:12).

I have had many friends make shipwreck of their faith, because they were taught that the way to hear and obey God was exactly the way listed in this prayer exercise. One girl who I was in a church worship band with, struggled with the truth that sodomy was sin. When my wife emailed her to give her truths of God's Word, scriptures to mediate on, both on the glory of man-woman union and condemnation of sodomy as an abomination, her response to Becky and I was that she didn't "feel the same way in her heart". In other words, she was unwilling to have her thoughts and feelings be subject to the word of God, because those were the very things she had been taught to trust in.
She is now a lesbian.

Haha... Nice.

There are many things wrong with this prayer exercise.

However, it is my further observation that I do not practice meditation or "consideration" of the scriptures. I don't believe myself to be alone in this failure. It is easy to be about the work of formulating arguments and defenses (work that we should do). Not so easy to be still and reflect on God's revelation, allowing it to work on us.