A circle is defined as the locus of all points equidistant from a central point. I like to think the central point in the circle of an engagement ring is love. Only actions that can relate back to that point are worthy of being a part of our circle. When we choose to commit to another person we are choosing to be accountable to love, against which every action and motivation can be measured. Your ring is a perfect symbol for that commitment, a daily reminder that your life is now lived in a new relationship, one in which love is the center.
A ring is also the perfect symbol for marriage because just like in a circle there is no end. It simply is. When you commit to a relationship of love you are committing to a relationship of lives intertwined beyond the simplicity of finding a beginning or end. The history and mystery of each individual is part of the ever unfolding story of your love together.