Why is Human Birth so Important?
The primary purpose of the human body is to gain the ultimate knowledge of the Truth, to enjoy the bliss of God and God-related spiritual pleasure in this very life, and to transcend to the abode of God after death. This is the purpose of life. Human is the only specie of 8.4 million in this universe that has free will and could do meditation. As we are born on this earth, it indicates that we will die. This is God's law that whatever is born will die. Look around yourself. Is there anyone who was born but did not die?
What happens during and after this life?
While we are alive on this earth, all of our deeds through physical action, thoughts, and speech are constantly being recorded by Chitargupt (the Lord assigned by God to record the activities of humans on earth). When we die, our karmas go with us; we are presented in the court of Dharamraja (the Lord of justice); in the court of justice, Chitargupt reads our recorded mental and physical actions, and then Dharamraja decides our punishment or reward.
If we do evil deeds on earth, then after we die, messengers of death beat the soul while taking the soul to the Dharamraja. Once we are presented in the court of Dharamraja, he instructs his men to put us in various kinds of Hell according to the severity of our evil deeds. Then we are again thrown into another cycle of 8.4 million species and finally a human birth with many economic, social, and physical problems.
On the flip side, If we remember God during our earthly time and perform good deeds, we will be given a position in Heaven for some time. Once the time is up, we are again pushed into another cycle of 8.4 million before we are given another Human birth on this earth to progress our Spiritual journey further.
Yet some did extensive meditation. These souls do not go to heaven or hell, but at the same time, they do not need to come back to earth; they merge with the Source/God.
Even human births are different; some are beggars, but some are kings because of their previous birth deeds. But whatever the circumstances in human birth, we have one most important power which no other species has, and it is Free-Will. Free-Will could only be utilized in human birth, using which we can change our destiny.
The Ultimate Aim of Human Birth
The main reason for this human birth is ONLY to meditate on God to free ourselves from the bondage of karma. As per our previous karma, we would get pain/happiness, rich/poor, etc., but keep in mind these are only the rewards or punishments for our last deeds and always remember that we do have free will even though it would be limited because the circumstances around it are the results of previous acts. Only in human birth can free will be utilized, and we can worship God. If we do not do that, this human birth will be in vain.
Death will come anytime, no matter how good food you take, how well-protected your house you have, how good physically you are, or how good doctors you have. In other words, no matter what, death will come at any time. If death is sure to come, what is the use of so many evil deeds we did to collect money, property, and relatives? Nothing is going on with us. Whenever we die, only our karma goes with us. Therefore, we must remember HIM (God) before we leave this physical body.
Some people do not believe in the above. They do not think so in Chitargupt, Dharamraja, Karma, 84 Lakh species. But when we die, we will come to know that these things exist, and we have to repay for our karma/deeds, but then it would be too late.
e.g., [Pigeon closes his eyes to shut out the cat's sight when the cat comes to eat him. Pigeon thinks that the cat cannot see him because he cannot see the cat. Of course, the cat remains, and the poor pigeon realizes it only when the cat takes hold of him. In the same way, denying the fact of Death, Karma, Court of Justice does not mean they do not exist. We will come to know when we will die, but then it will be too late. ]
e.g. [Once, a poor gardener found a bag full of beautiful stones. He used all the stones to fly the birds away from the fruits. During this time, her wife came to him and saw the rocks. She said the stones were beautiful and requested her husband to allow her to take the last rock home to keep it. The gardener approved, as only one stone was left with him. His wife brought that stone to her house and stared at the rock while sitting at the house's door. Then one jeweler saw the stone and questioned the gardener's wife. The jeweler offered thousand dollars for that one stone. The gardener told his husband, and now, both of them realized the rocks that the gardener used to fly away birds were expensive. Now, both started to feel very bad because the gardener used such costly stones for nothing but apart from being sad, he could not do anything. Same way, suppose the rocks are our breaths. We do not understand the importance of human birth and its limited breaths, so we're just wasting the expensive breaths on nothing. If we were aware of the significance of this human birth and breaths, we would have positively utilized them by remembering God. ]
e.g. [A king wanted to choose the best responsible person for his thrown, so he held a meeting with his three sons. He ordered his sons to travel to all religious places within one year and gave them three horses (one for each) which they had to use for traveling. The first son did not start his journey, fed his horse exceptionally well, and converted his horse into very fat. The second son started his journey, and he tried to complete the trip as soon as possible and therefore ignored his horse's health. He overused his horse's capacity; eventually, his horse died before completing his journey. The third son was wise; he calculated that if he traveled this much distance each day, he would be able to complete his journey on time. This way, he traveled a pre-planned distance each day and cared for his horse by giving him proper food and rest. Eventually, he completed his journey within the provided time.
The third son, who completed his journey on time by visiting all religious places, was chosen as the next King. The king gave the one who did not start his journey punishment. Similarly, God has given us this body (as a horse) so that we can complete our spiritual journey to God within this human birth time. If we did not remember God during our time on earth, then we are like the first son, and therefore we will be punished by the Lord of Justice by throwing us into Hell or giving birth to lower species. If we act like the second son and, due to Virag, we did hard penance of God without taking care of our body; then we might get another chance (another human birth) from God so that we can continue our journey. We should act like the third son by remembering God and caring for our body by fulfilling his needs. i.e., When we were in our mother's womb, everyone (regardless of caste, creed, and religion) promised God that we would do God's worship for at least 2.5 hours out of 24 hours. This is the primary duty that we have to do, along with our worldly responsibilities. ]