We know from His Teachings that Reincarnation does not exist. We come on to this planet once only. Our life here is like the baby in the womb of its mother, which develops in that state what is necessary for its entire life after it is born. The same is true of us. Spiritually we must develop here what we will require for the life after death. In that future life, God, through His Mercy, can help us to evolve characteristics which we neglected to develop while we were on this earthly plane. It is not necessary for us to come back and be born into another body in order to advance spiritually and grow closer to God. This is the Bahá’í Teaching, and this is what the followers of Bahá’u’lláh must accept, regardless of what experiences other people may feel they have. You yourself must surely know that modern psychology has taught that the capacity of the human mind for believing what it imagines, is almost infinite. Because people think they have a certain type of experience, think they remember something of a previous life, does not mean they actually had the experience, or existed previously. The power of their mind would be quite sufficient to make them believe firmly such a thing had happened.
(Shoghi Effendi, Lights of Guidance, p. 538)