I was curious about this, so I thought I'd look it up...
"When the Justice card appears in the future position of your Tarot reading, the things that you are working on in your life now are inevitably leading you toward having to make a big decision. We think of many things in life as solid, but no matter how firm they are, most things are fleeting or transitory. The deepest friendships of our youth are affected by geography and the shift of what we choose to do with our lives. These shifts are imperceptibly slow, but it is as if they do not actually change until we notice that they are changing; by then they are too far removed from what they once were to ever be again as we lived them. The Tarot is telling you to get ready for a big change no matter how minor a decision you are about to make."