The major obstacle at every stage of the path of enlightenment is our own thoughts. Thoughts keep us separate. Even the thought of Unity is far different from Unity. And the thoughts keep coming; each one making its bid for our attention and identification. Are all thoughts part of the illusion? Yes. Are some thoughts better than others? Just diving into the water is aided by a spring board, and crossing the great ocean is aided by a raft, so certain thoughts are useful along the way. At the final moment, of course, even these thoughts must be transcended.