Yoga Sutra 1.40 mastery extends right to the ultimate atom

Sūtra I.40 His mastery extends right to the ultimate atom and to the ultimate magnitude When he concentrates on it, he can steady his mind on anything subtle, right down to the ultimate atom; when he concentrates on it, he has steadiness of mind on anything substantial, up to the ultimate magnitude. When one can take his practice to either at will, it is full mastery; when he has full mastery, he does not require further practice in training. The words right to are to be taken with both the extremes. When he concentrates on something subtle, in the course of his practice the mind experiences things progressively smaller and smaller till he comes to the ultimate atom. By practice he becomes able to remain steady in that experience. When he can take his practice to either limit at will, it is full mastery. He has complete mastery who is …

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