Essentially Love.

Ultimately it is understood that there is only the REAL and that that reason why the REAL is (or rather has conceived itself to perceive itself as) SELF differentiated* is so not to be or rather feel alone. As such the real reason of being, the meaning of existence, the purpose of life. The purpose of life, the meaning of existence, the reason of being it is companionship, it is friendship, it is love; love so love. (* BIOdiverse)
~ Wald Wassermann, Physicist