Your mind is an instrument, a tool. It is there to be used for a specific task, and when the task is completed, you lay it down. Most people's thinking is not on repeatitive and useless, but because of its dysfunctional and often negative nature, much of it is also harmful. It causes a serious leakage of vital energy.
Thinking is actually an addiction. You no longer feel that you have the choice to stop. It seems stronger than you. It also gives you a false sense of pleasure, pleasure that invariably turns into pain.
Enlightenment means rising above thought, not falling back to a level below thought, the level of an animal or a plant. In the enlightened state, you still use your thinking mind when needed, but in much more focused and effective way than before. You use it mostly for practical purposes, but you are free of the involuntary internal dialogue, and there is inner stillness. When you do use your mind, and particularly when a creative solution is needed, you oscillate every few minutes or so between thought and stillness, between mind and no-mind. No-mind is consciousness without thought. Only in that way does thought have any real power. Thought alone, when it is no longer connected with the much vaster realm of consciousness, quickly becomes barren, insane, destructive.