At the spark of your soul's first light, there was a division.
The final division of the soul that took place eons and eons ago could be likened to the separating of a magnet into two separate pieces. Each piece would be predominately one polarity or the other but a residual amount of its opposite essence would always be present within itself. So it is with the divided twin (soul). The masculine half has always retained some of the original feminine energy that the soul first possessed while the feminine half still holds onto a part of the masculine essence it once was united with. Since that time we have roamed around in this incomplete state of being experiencing life after life and relationship after relationship until we decide we've had enough and want something more fulfilling. In order for that to happen each twin must first achieve a balance of masculine and feminine essence within themselves and bring that balanced energy to each other to complete the whole.
Ultimately, each and every one of us will reach a point when a very serious choice and commitment is made... to begin the process of growing and evolving on a spiritual level. As that happens we will rediscover our true spiritual nature and go through an inner transformation that is so profound it will affect the deepest part of our being. At that moment the soul begins to crave completion with its Source in a way that is difficult to describe unless one has experienced it. Part of this craving will be satisfied by reunion with our twin.