The knowledge of how to conceive a child is vital to bring forth good souls on earth for building a better world.
The mental state of the couple at the time of conception determines whether a good or evil soul will be attracted to enter the womb. Yogananda, the world-famous author of Autobiography of a Yogi, said: “At the time of physical conception, there is a flash of light in the ether. Souls in the other world that await physical rebirth, when the vibrations of that light are compatible to their own, rush towards it. Sometimes more than one soul enters a womb at the same time. Thus, twins are born.” “For couples desiring spiritual children,” Yogananda continued, “it is important that they keep their consciousness uplifted when coming together in physical union. For their vibrations at that moment will determine the quality of the flash of light in the astral world.” (The Essence of Self-Realization: The Wisdom of Paramhansa Yogananda, p. 76)
Satyananda (1923–2002), one of the greatest spiritual masters of India, scientifically observed: “In recent research on dying, the experiences of those who have been revived after death have been recorded. It was found that they first entered into darkness and then felt agony and pain. They heard peculiar cries and screaming. After some time they found the darkness was diminishing and the light was growing little by little, just like a dawn of a new day…Then they returned again through the same darkness. Now, it is not the experience that is important here, but who experienced it. If a man was dead and nothing survived, how could he have this experience? This proves that the soul survives death.” (Building a Noble World, p. 12)
The idea of rebirth/reincarnation is scientific. According to modern science, energy is indestructible. The Law of Conservation of Energy specifically states that energy can neither be created nor destroyed. We observe earth, moon, and sun are moving in a circle. Seasons move in a circle. In the same way, life also moves in a circle: birth, death, and rebirth. A soul is never destroyed when its physical body is destroyed by death. Ancient Greek philosophers, such as Pythagoras and Socrates, believed in rebirth and taught the doctrine of Rebirth. Just as about 500 years ago when Columbus (1451-1506) lived, most people thought that the earth was flat, so also most people today believe that the soul does not survive the death of the physical body. Jews, Christians and Mohammedans do not believe in rebirth, whereas Hindus, Jainas, and Buddhists believe in rebirth.
Charles Darwin (1809 – 1882) outlined the theory of evolution but he missed the point. The body of a monkey does not become the body of a human being. It is the soul, not the body that evolves. The truth is the cycle of birth - death- rebirth continues, allowing the evolution of a soul. Describing the mystery of death, life after death, and reincarnation, Sivananda (1887–1963) wrote: “This subtle body comes out with all its impressions and tendencies at the time of death of the gross physical body. It is like vapor. It cannot be seen by the physical eye. It is the subtle body that goes to heaven. It manifests again in a gross form. This re-manifestation of the subtle form into the gross physical form is called reincarnation. You may deny this law, but it exists. It is inexorable and unrelenting.” (Building a Noble World, p. 11-12)