If one's train of thought is not clear enough, it means one lacks meditative concentration (dhyāna), and one should cultivate more concentration to make one's thinking clearer. When the power of concentration is insufficient, the mind consciousness cannot follow a single main thread in its thinking, and will become distracted in all directions, without any focus. It is like the qi channels not running along a single line but darting about everywhere within the body. Only a person with strong logical thinking ability, relying on powerful meditative concentration, can achieve single-pointedness, like an awl driven deeply into a single point. A person without the power of concentration is like a wooden board lying flat on the ground, leaving no trace.
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