It would be really hard to walk anywhere if there was no gravity, no traction. I need my faith for traction and sense of direction. But truth is even more important than love, I had to tell my kids (they were a little taken aback). Without light, you could walk right off a cliff or hurt your knee on a pointy object. But light without gravity would be pretty frustrating. I'd just be directionless, floating, and without much purpose.