Why must we control our mind, but also our thoughts, words, and actions?

This is what happens to those who must reincarnate.

Each of us is, in truth, a spiritual soul or spiritual being, and not the dense material body in which we reside and with which we wrongly identify. We can prove this through our consciousness, which is actually the energy of the soul, the manifestation of the latter, which, spreading throughout the body, takes control of it and, through the soul's life force, gives it life. Consciousness is proof of the soul's presence in the body.

In truth, death is only the end of the life of the material body, which will decompose, and whose various elements will return to the different sectors of material nature from which they originated. The body is, in reality, an inert mass of material elements. The soul, which is immortal, continues its existence and reincarnates according to the law of karma and the nature of its actions. It therefore has an experience separate from the gross material body. In reality, the soul is imprisoned in an ethereal body, itself imprisoned in a gross material body. Thus, during reincarnation, it is the ethereal body that transports the soul to its new body, which a new mother will give it in her womb. The celestial beings, who are God's assistants in this process, take on this wonderful duty.

The Supreme Lord, Krishna, says: At the moment of death, the soul takes on a new body, as naturally as it passed, in the previous body, from childhood to youth and then to old age. This change does not disturb one who is aware of their spiritual nature.

The process of reincarnation continues until the soul is liberated from material existence. And to be freed from material existence, one need only surrender to Krishna, obey Him, do His divine will, and serve Him with love and devotion forever.

The Lord further says: It is the thoughts and memories of a being at the moment he leaves his body that determine his future condition.

This is why, with this statement, Lord Krishna advises us to control our thoughts, words, and actions, for they produce effects and therefore disastrous consequences if they are rooted in evil.

Also, if we utter a specific thought, it will be interpreted by God on the one hand and the celestial beings on the other as a desire, and we will then obtain it in our next life.