First, there’s the awareness that every person you deal with in any way is created in God’s image, and so what you do to them you do to God.
Just as you cannot harm a child without harming the parent, you cannot harm your neighbor without harming God. Just as an act of kindness to a child is an act of kindness to his or her parents, an act of kindness to your neighbor is an act of
kindness to God.
This is similar to the jewish view, or at least a jewish view, of the hereafter. The concept that our world and the hereafter are not two distinct worlds, but are rather directly linked and intertwined, so that what we do on earth has a direct impact on heaven. From this viewpoint, we can say that each commandment exists to remind us that all acts are sacred or at least have the potential to be sacred – to effect both earth and heaven.
So the awareness that comes from understanding that everyone is created in God’s image can, I think, be a general principle for all the commandments that deal with interpersonal relationships.
There’s a second, “corallary awarness” that should flow from the understanding that we are created in God’s image. It should be self evident but because it is so obvioulsy, it is often overlooked.
It is not just the the rest of the people in our world that are created in His image. It’s us. In a real sense, we’re
commanded to acknowledge that we ourselves are created in God’s image and, because of that, we are holy. Not just our neighbors.
This type of awareness covers, I think, all the other mitzvot that do not, on their face, deal with interpersonal relationships. Because as creatures made in the image of God, each thing we do, every action, whether it is prayer, eating, work, waking up in the morning, etc., is done by a representative and as a representation of God.
One of the first things I learned when I started studying Judaism was that the mitzvot can be viewed as religious speed bumps. Commandments that demand that, throughout the day one
pause from the mundane recognize and acknowledge the sacredness of each moment. Constant reminders that there is something greater than ourselves and that we are part of
something greater than ourselves.
As a general principle being created in Hashem’s image demands
that kavanah (focus/intent/awareness) be brought into all our actions. If the mitzvoh are religious speedbumps to remind
us throughout the day of the sacredness of life, of existence, then being created in God’s image is the meta-speedbump that reminds us to bring kavanah to all the mitzvoh.