The whole structure of the conscious as well as the unconscious is in the framework of time - time being not only chronological time but also psychological time. We have divided this consciousness as the superficial and the hidden. The superficial is the educated mind, the modern mind. And then there is the hidden mind. To become conscious, to know all the contents of our mind, requires an attention, an observation which is attentive - not in terms of condemnation or justification, but merely attentive.
Attention is necessary in order to find out the whole content of the unconscious .
And in that focusing of the thought on a particular thing, which is called concentration, there is an exclusive process - you are putting everything aside. Concentration is not attention because in attention there is no resistance. Now, if you are attentive, you listen to the noise of the train on the bridge, you listen to the hoot of the train, you listen to the speaker. But if you are concentrated, you cannot be aware of all this extraordinary movement. This means that the conscious mind must not see any result, it must not wish to transform what it sees, it must not try to interpret what it sees according to its likes and dislikes.