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12. The one-pointedness of the Chitta is when the impression that is past and that which is present are similar.

How are we to know that the mind has become concentrated? Because the idea of time will vanish. The more time passes unnoticed the more concentrated we are. In common life we see that when we are interested in a book we do not note the time at all; and when we leave the book, we are often surprised to find how many hours have passed. All time will have the tendency to come and stand in the one present. So the definition is given: When the past and present come and stand in one, the mind is said to be concentrated.[1]

एतेन भूतेन्द्रियेषु धर्मलक्षणावस्थापरिणामा व्याख्याताः ॥१३॥