Now, since the supreme Brahman cannot be known through the senses or the mind, there has to be some other instrument. That can come about only when the mind has settled down and stopped all its acrobatics; trying to reach here and there like a monkey on a tree. Going within and without, everything has to stop.
Sadhana is merely a preparation for that. If it were going to be always unknown, there would be no point in studying Upanishads. But to be in a position to read and understand the subtle truths in the Upanishads, the mind must first get still and stop its wandering. Sadhana only helps us to try and stay quiet. The Brahman is like a flash of lightning, all in the winking of an eye, for which one must prepare oneself to be ready when it comes.
Now, we come to an important part of the discussion—where does meditation come into all this? How is meditation connected to this? What is meditation? Is meditation about sitting down in one place and closing your eyes and thinking about it? Or does meditation mean to shut out all thoughts? So, when all thoughts are shut out, what happens next? Is this possible at all? Am I not still there, trying to shut out all the thoughts? So, one has to see how this works. For this, the only tool that we have is meditation.