Following the creation concept that creation processes differed from preservation processes, it is suggested that God endowed each created kind, at the time of its creation, with potential for vast variety.
We've got this gift of love, but love is like a precious plant. You can't just accept it and leave it in the cupboard or just think it's going to get on by itself. You've got to keep watering it. You've got to really look after it and nurture it.