For concentration, everything has to be smaller than the smallest. Otherwise, our eyes will be roaming from this side to that side and our concentration will go away. We will not be able to focus; we will not be able to penetrate the object of our concentration. If you are lifting weights, whether it is 90 pounds, 100 pounds, 120 pounds or 200 pounds, do not think of the size of the weight. Just take the whole object that you are lifting as absolutely smaller than the smallest. Whenever you concentrate on something, you have to feel that that particular thing is very, very tiny. On the strength of our imagination, we make the object of our concentration extremely small.
For meditation, it is just the opposite. We have to imagine something as large as possible. On the strength of our imagination, we meditate on something vast. Meditation is vastness, while concentration has to be focused on the tinier than the tiniest object to be successful.From:Sri Chinmoy,Rainbow-Flowers, part 3, Agni Press, 1999
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