In plain words
So it is essential to inquire what crop the jīva is to raise in this kṣetra and what fruit it is to reap.
Then, in the second meaning of kṣetra, there is Kāśī-kṣetra. Prayāga-kṣetra. Holy, divine places like these have also come to be called kṣetras. So, in this second meaning of kṣetra, ‘Deho devālaya prokto jīvo devas sanātanaḥ’: here Īśvara, who is eternal, is named as the jīva, the ancient one, in the new body. So we must hold this body to be a temple of God as well. We must clean this temple called the body in many ways and make it holy. Purity is not bathing ten times a day and sinking into superstitious customs of ‘Don’t touch!’ ‘Don’t touch!’ Purity does not mean making our body holy with water alone. This body has to be purified in four ways. The body is to be purified by water, speech by Satya, the jīva by learning and tapas, and Buddhi by Jñāna. Only when these four kinds of purity are attained does this temple called the body become pure and take on a holy form. So, on the day we purify ourselves in the way said above, on that very day one earns the true name ‘he whose antaḥkaraṇa is pure’. So we must inquire in all these ways into the secret of what is called the body. Once we have recognised this secret, we recognise the Satya that the body is not oneself. It is through the delusion ‘I am the body’ that man falls into so many kinds of sorrow. So when we inquire into the body's secret in this way and recognise it, these delusions about the body will not torment us, and we shall have the chance to gain unbroken Ānanda, falling into no sorrow or grief of any kind.
Next, we must look a little into what are called the senses. Another name for the senses is ‘mātraḥ’. ‘Mātra’ means a measure. What kind of measure is this? A small example. We judge whether the dal has too little salt or too much. But the one that finds out whether the salt is too much or too little is the tongue. So it is called ‘mātra’. This man is really quite handsome. But it is the eye that decides that his nose alone is a little small. These eyes are the measuring rod that judges a man's good looks. Ah! How melodious this music is, what a delight to the ear! Or else how harsh it is on the ear: our ears are the measuring rods that decide this. Then the fourth: the sense that measures ‘this is a foul smell, this is a sweet smell’ is our nose. In this way all the senses in our body are made as measuring rods, each for its own object.
Here ‘mātra’ has one more meaning as well. A limit; that is, the Paramātma gave each sense so that it might be made holy along its own path.