It's funny you should say that because I have something similar, but on a completely different subject, the trinity. I have always "liked" the comparison to how we experience the sun. We all experience the sun's light, the sun's heat, and the sun's radiation. All three "are" the sun, but we experience them in different ways, and they have different purposes (functions). It seems like a neat little way to explain it, but I have read that the analogy is flawed. However, I've never found an explanation. Therefore, I've never used it in witnessing. Has anyone heard of this before?
That is one way to understand it, but it is difficult for us to relate to the sun as anything we resemble. Humans are created in a trinitarian model in that we possess the wisdom (intellect), that generates words, through which the spirit of your mind becomes evident. All three are one in essence (nature), that is human, all three are perceived as separate entities, yet one being, all three are interrelated and indivisible.
Thus I know there is someone called FK, I know that he or she is human, I know your mind only trough your words (you can come to the Father/Wisdom only through the Son/Word!), and your words send out what can be described as the spirit of FK's person.
We need not look farther than humanity to find God's signature.