Maharishi Patanjali says about meditation in Yogasutra (3.2)-
तत्र प्रत्ययैकतानता ध्यानम् ।
That is, meditation is the constant concentration of the mind in the place where the mind is applied. Maharishi Patanjali Ji wants to say that keeping the mind focused on one place i.e. on any one part of the body, the heart, the middle of the brow, or any deity or picture, etc. is a Dharana, but wherever the mind is focused, it stays in that. Meditation is the concentration of the mind and no other thoughts arise in between. For example, concentration is to fix, stop or stop the mind on any formless or formless form of God, but meditation is to stop the mind completely on that formless, corporeal, formless form of God. At that time, there is no place for any other thoughts except God in the mind, in the mind, only God’s light remains, that is meditation. Meditation is the stopping of the mind in the sky while perceiving the sky. There the mind immersed in the sky itself becomes sky-like. There the mind is in the sky and the sky is in the mind. At that time, there is only unbroken thought or attitude of the sky in the mind, not of anyone else. Ultimately, the ultimate goal of yoga practice is “samadhi” for that unbroken instinct of the mind to merge into the sky, to drown in the sky, to disappear in the sky itself. Samadhi is the culmination of meditation, the conclusion of meditation. Similarly, fixing the mind on the rising sun in the morning is dharna, but when that dharna becomes so deep that the mind stops in the same sun, in the same image, in the same attitude, then it is meditation. Samadhi is the dissolution of the mind completely in the same attitude, in the same sun, becoming absorbed in it.
The rising sun is like a fire sitting amidst the redness of the light, which is visible now, but as the light becomes more intense, the sun appears like a ball of fire. Ultimately that situation comes, when that ray of light becomes completely in the form of fire. Those light rays then have no independent existence of their own. It becomes fire. Then there is no difference between light and fire. Both become identical. Regarding samadhi, sage Patanjali says in Yogasutra (3.3):
तदेवार्थमात्रनिर्भासं स्वरूपशून्यमिव समाधिः ।
That is, when in this process of meditation, only the object on which the attention is being focused, only that object remains and the self-nature of the mind becomes zero-like, then the same meditation becomes samadhi. Just as the sun’s rays are collected on a piece of wet glass, fire is generated and the paper burns from it, in the same way, the meditation of the meditator on the divine or the other object of meditation, as meditation deepens, By the way, the energy of meditation, the fire of meditation keeps getting accumulated in the mind. Then the energy of meditation, the fire of meditation, becomes so intense that the seeds of karma-sanskars imprinted in the unconscious mind of the meditator start burning with that fire of meditation.
Just like a small spark is enough to burn the entire forest area. A small spark turns into a wildfire in no time and the entire forest area gets burnt to ashes. In the same way, the fierce fire of meditation generated in the mind slowly engulfs the sanskars prevailing in the mind and within no time, the seeds of the accumulated deeds in the mind begin to die. The end goes on getting pure. Yes, this situation does not come only immediately, for this the seeker has to remain undisturbed, regularly, patiently, and faithfully in the practice of meditation for a long time. Only then that huge meditation can be generated in his mind, due to which he can destroy the roots and vegetables of his mind.
In the same way, the seeker also transmits the energy of meditation manifested in the conscious mind to the unconscious mind in the state of meditation and burns the rituals of the mind. By continuing this process of meditation for a long time, the unconscious mind becomes cultureless and shines, it becomes refined. Then the covering of ignorance-like impurities on the soul also vanishes and all the three types of Karma Samskaras like Sadhak, Avidya, Asmita, Love-Aversion, Abhinivesh, etc. Only the Kaivalya state is attained. Then he experiences ultimate bliss, Brahmanand every moment. In the words of Maharishi Patanjali, at that time, when the instincts of the mind are completely restrained, the seer (soul) becomes stable in its form, that is, it attains the state of Kaivalya. That is, Samadhi is the name of the sanskar-less, viceless, thoughtless, and pure state of the mind. It is in this state of mind that the soul realizes its true blissful form. In that state, consciousness arises by connecting with self-consciousness. The soul becomes imbued with divine energy and a divine exchange begins between the soul and the Supreme Soul.
As soon as it is connected with meditation, the self-consciousness gets attracted to the divine consciousness and starts becoming blissful. The seeker gets familiar with himself, and self-consciousness and rises towards the light. Descending even deeper into the state of meditation, flowing in the strong flow of meditation, the seeker feels himself to be divine. On the other hand, due to the sophistication of the unconscious, the seeker becomes free from many mental disorders and diseases. Due to the refinement of the mind, it becomes healthy not only mentally, but also physically. In that state, he gets free from various psycho-physical ailments and starts living a happy and healthy life. Due to the accumulated energy, and concentration of the mind generated due to meditation, he starts achieving success in other social areas of life as well. His self-confidence and morale become so strong that he does not give up even in adverse circumstances and makes those adverse conditions favorable to him. Desperation and despair can never even touch him; Because his life view becomes optimistic.
This is the imperishable, integral, and non-dual state of unity of the soul and the Supreme Soul, which is known by various names like Samadhi, Self-realization, etc. Astu, it is clear that with the continuous practice and effect of meditation, as the instincts of the mind get destroyed, the mind becomes pure, and the mind becomes pure. Samadhi happens in the same pure mind, then the seeker does not have to meditate, rather meditation starts happening automatically within him, he is in meditation not only with closed eyes but also with open eyes. Not only while sitting in any Sukhasan, Padmasan, etc., but while walking, running, eating, and getting up. While sitting, sleeping, and awake, he is also in meditation; Because then his mind becomes meditation.
Spirituality is beyond science 