Imagine that you and I are sitting at opposite sides of a table in a restaurant. I confidently declare that I am here and you are over there. You then claim exactly the same thing, even although your here is my there and vice versa. Yet there is no inherently existing here or there for either of us. My here only exists in relation to you, and your here only exists in relation to me. Nevertheless, we are both factually correct in the context of the spatial relationship of our seating positions at the table. 

We would certainly be mistaken in concluding that here does not exist at all; and we would be wise to acknowledge that my here and your here exist only in dependence on relational factors and conditions. Similarly, our sense of self persists only in relationship to each other. While there is no doubt that I exist and you exist; it is beyond question that in many important respects I only exist because you exist. Because neither of us can make a legitimate claim to be the centre of our universe, it makes perfect sense to respect all other living beings as much as ourselves.

(See Geshe Tashi Tsering, 'The Awakening Mind' (2008), p71)