The Supreme Lord, Krishna, says: “At the moment of death, the soul takes a new body, as naturally as it passed from childhood to youth and then to old age in the previous body. This change does not disturb those who are aware of their spiritual nature.”
The process of reincarnation continues until the soul is freed from material existence. And to be liberated from material existence, it is sufficient to surrender to Krishna, obey Him, do His divine will, and serve Him with love and devotion forever.
The Lord also says: “It is the thoughts and memories of the being at the moment when he leaves his body, which determine his future condition”.
This is why, by this word, Lord Krishna advises us to control our thoughts, words and actions, because they produce effects and therefore disastrous consequences, if they are anchored in evil.
Also, if we emit a precise thought, it will be interpreted by God on the one hand and the celestial beings on the other hand as being a desire, so we will obtain it in our next life.
Here are some examples of karmic sanctions.
If we think of our pet at the time of death, it will be considered a wish, God will grant it, and we will reincarnate in an animal body identical to the one we thought.
Those who like to play with water, river, lake, in the open sea, or like surfers with the waves at the edge of the beach, will be granted, they will obtain an aquatic body in their next existence.
When heads of state show authoritarianism, enslave their own people to the point of not allowing them to have access to true spiritual knowledge, and rule their country unaware that they must do so under the authority of God, they will go to an infernal planet, located in hell.
In the same way, when leaders oppress a community, enslave a people, occupy a region forcing its inhabitants to live in poverty, with almost nothing and under great suffering, they will be condemned by divine justice to be reborn in this community, in this people, in order to know in their turn the sufferings they inflicted on them.
It is very common for politicians, developing a racist, hateful, degrading philosophy towards a community other than their own, to be condemned by their karma, law of action-reaction or law of cause and effect, to be reborn in their own country, but in a poor family, in the community they hated, in order to know the suffering of racism that they themselves spread in their last life.