The teachings and practice of Yoga and Buddhism is about liberation from the inevitable suffering of an impermanent and selfless worldly life existence deriving from the conditional and limited existence and function of a selfless impermanent physical body along with the ignorant egoistic impure restless modification of the perceptive and cognitive intellectual egoistic thinking mind, where the vanish of the idea of 'I', or the ego, or the delusive existence of an individual being, upon the absence of attachment and desire, or the annihilation of the restless modification of the selfless mind, where the realization of selflessness/'I'lessness/egolessness/birthlessness/deathlessness/oneness/attributelessness/namelessness/formlessness takes place, is the aim of the Yoga and Buddhism practice.
All forms of practice in Yoga and Buddhism is nothing but mind purification, or silencing the selfless and restless modification of the mind. It's not about the mind having only pure, good and positive thoughts or thinking, or void of impure, bad and negative thoughts or thinking. It's not about changing the perceived world to be all pure, good and positive, and nothing impure, bad and negative. It's definitely not about performing rituals and sacrifices to be accumulating merits and virtues to receive 'blessing' and be qualified to 'migrate' to a place called 'heaven'.
All the perceived names and forms, or the thinking, or the thought activities, or the perceived world of enjoyment and suffering, are just what they are, neither pure nor impure, neither good nor bad, neither positive nor negative. And both the perceiver and the perceived are impermanent and selfless.
Mind purification is indeed the entire process of the practice and it comes to an end upon the complete annihilation of the mind.
It's about freeing the mind from ignorance and egoism that give rise to restless modification of the mind, which hinders the cognitive mind from knowing Thyself, where the modification of the perceptive mind give rise to a selfless impermanent worldly life existence consisting of the idea of 'I' and everything that 'I' perceive, think and know, which generates duality and separateness that gives rise to all sorts of suffering, where all THESE are nothing but selfless impermanent changes of names and forms ceaselessly arising and passing away within the modification of the mind, in NOW.
There's no 'I', or the existence of an individual being. There is neither a past nor a future. It's merely impermanent selfless changes powered by the law of nature, cause and effect. Past and future only exists within the modification of the mind as memories and imaginations in the form of thinking or thought activities.
Countless thoughts/sensations/feelings are arising and passing away, or ceaseless 'births' and 'deaths' are happening selflessly, within the modification of the mind, in NOW. The perception of 'enjoyment' and 'suffering' is within the modification of the mind, in NOW. The selfless modification of the mind gives rise to countless worlds of pleasant enjoyment and painful suffering. There's no world upon the annihilation of the mind.
All forms of longing, clinging, disappointment, dissatisfaction, anger, hatred, greed, hurt, guilt, regret, grief, painful sorrow, fear and worry vanished upon the direct realization of THIS.
Craving and clinging towards enjoyment, and desiring to create permanent enjoyment in this life existence, is not freedom. Aversion and rejecting towards suffering, and desiring to escape inevitable suffering within this conditional and limited impermanent and selfless life existence, is not freedom.
Free from attachment and desire of craving and aversion, going beyond the mind perception of enjoyment and suffering in this fleeting worldly life existence of an impermanent and selfless body and mind that needs constant restless maintenance, that is limited and conditioned by the law of nature, that is inevitably bound by the physical and mental suffering of restlessness of impermanent selfless changes, that is subject to decay, old age, illness and disintegration even after all the restless maintenance to be surviving, and eventually annihilating the mind, is freedom, in NOW.
Freeing the mind from egoistic attachment, identification, desire of craving and aversion, judgment, comparison and expectation, which leads to removing the veil of ignorance and thinning out the modification of the mind, allowing the mind seeing the truth of itself, or knowing Thyself, as it is, which is Impermanent and Selfless.
"Form is emptiness. Emptiness is form. Form is not different from emptiness. Emptiness is not different from form." - The teachings of Buddhism
"On the whole, life is a sorrow." - Siddhartha Gautama Buddha
"There's only one book to read - This heart." - Ajahn Chah
"Brahman is real. The world is unreal." - The teachings of Yoga Vedanta
"Sarvam Duhkham Vivekinah - All indeed is pain to a person of discrimination." - Patanjali Maharshi
"Kill the mind." - Swami Sivananda
Contemplate on the teachings.