If we look at the world around us, we see that we are conditioned to not listen deeply. Because isn't that what silence is? It's a listening, a deep wordless listening.
So, to meditate is to purge the mind of its self-centered activity. And if you have come this far in meditation, you will find there is silence, a total emptiness. The mind is uncontaminated by society; it is no longer subject to any influence, to the pressure of any desire. It is completely alone, and being alone, untouched it is innocent. Therefore there is a possibility for that which is timeless, eternal, to come into being. This whole process is meditation.
Now the Sirens have a still more fatal weapon than their song, namely their silence... someone might possibly have escaped from their singing; but from their silence, certainly never.
Sit in meditation ! But do not think ! Look only at your mind ! You will see thoughts coming into it ! Before they can enter, throw these away from your mind till your mind is capable of entire silence.