What is Love? How do we know it? How are we One in it? The mystical experience shows us directly not only what Love is, but that we are Love.
In the debate between science (or materialism) and spirituality, there are few who embrace both sides of the coin, who can see that they are One.
Many religious people believe that the spirit or soul is the ego-self, our personality, the person we think we are in our heads, our psychological "self," with all our memories and experiences and relationships, etc. But none of this existed at our birth.
Sophia von Klingnau was a nun who lived in a convent in Klingnau, Switzerland, sometime in the 13th or 14th century. Her writings were published in the Schwesterbücher (Sister Books).
How did Jesus say we are to love ourself? How could we know how to love our neighbor unless we first knew how we are to love ourself? It seems Jesus was referring back to something he previously said, so that we could love our neighbor likewise.