In plain words
Today scientists are discovering a great deal. But they are unable to know the divine power that lies in humanity. A small example. The earth is one and the same. Plant a lemon seed, and the fruits that come from the lemon tree are sour. Plant a mango seed, and the fruits of that mango tree are sweet. Plant a neem seed, and we know that the neem fruits are bitter. Though the earth is one, these seeds do not hold one and the same essence. In the same way, though hydrogen, nitrogen, oxygen and carbon are in man, the intelligence of each person takes its own separate course. What is the reason for this? Science does not tell this. No one can say that the power of God is like this or like that. Science and spirituality differ in this: science examines the outer world. Spirituality examines the divine principle within. One with outward vision is a scientist. One with inward vision is not a scientist but a saint. There is a great difference between a scientist and a saint.
That which ends just where it began has been called the Full.
That is full, this is full; from the full the full comes forth. When the full is taken from the full, the full alone remains.
Spirituality is that which is full, like a circle. Its beginning and its end are one. There is no difference between beginning and end. If you cut the full circle in the middle, it becomes a semicircle. This, this becomes the English letter C. C stands for science. It begins at one point. It ends at another point. Between beginning and end lies an abyss beyond reach and beyond sight. It cannot be reached; it cannot be seen. Matter and spirit are both semicircles. They examine only matter; they do not examine spirit. So the principle of these two has been called Prakṛti and Paramātma. One who examines creation is a scientist. One who examines the Creator is a saint. The scientist examines only creation; but if he examines the Creator, the whole of creation becomes clear. That is why Tyāgarāja said, "Rāma! If I have Your grace alone, it is enough. All the planets are in my hands." If we understand the Creator, the whole of creation becomes clear to us. Creation lies within our senses. We need make no special effort about what lies within our senses: we see with the eye, hear with the ears, experience with the mind and reflect with the heart. Doing with the hands, the mind, speaking with the mouth: these are all the senses. Talking, walking, reading: all of it is the senses. What is beyond the senses we call "that, that"; otherwise we say "this, this." We say, "Pūrṇamadaḥ, pūrṇamidam." In this lies the difference between That and this.