In my regular blog rounds this morning I stopped at Marshian Chronicles and read a really good post on Casting Vision. He provided a link to Jolly Blogger, who had a really good post about Visionary Dreaming. They both quoted from a book by Deitrich Bonhoeffer called "Life Together".
I'm going to give you the quote from the book that they used, but before you form your opinions from just that one quote - which will leave you with a lot of objections - I'd recommend you go read the other post which clarify. I agree with Louie over at Marshian Chronicles in that visionary dreaming isn't bad at all. It's just how you go about it that can be bad.
So here's the clip from the book:
"God hates visionary dreaming; it makes the dreamer proud and pretentious. The man who fashions a visionary ideal of community demands that it be realized by God, by others and by himself. He enters the community of Christians with his demands, sets up his own law, and judges the brethren and God Himself accordingly. He stands adamant, a living reproach to all in the circle of brethren. He acts as if he is the creator of the Christian community, as if his dream binds men together. When things do not go his way, he calls the efforts a failure. When his ideal picture is destroyed, he sees the community going to smash. So he becomes, first an accuser of his brethren, then an accuser of God, and finally the despairing accuser of himself."