The Gene is Self and the purpose is Love.

Some evolutionists once claimed that the universe was an indifferent and purposeless place devoid of a grand designer before it was understood that the universe is self and that it is self which perceives itself as differentiated so not to be by itself. For such is the purpose of self. The purpose of self is companionship. The purpose of self is friendship. The purpose of self is love.
~ Wald Wassermann