Why our existence is contingent on God's judgment and sight. Without any light from God and his witness of the time, we would be totally clueless to who we are. I would say also we rely on God's light and judgment to know ourselves. It's God's light that makes us to some degree know ourselves but reality no one knows anyone no matter how good or how evil but God himself.
It's this reality, that we can only be known to God the Perfect judge, that to me is the strongest way to remind yourself of God's existence.
You cannot do without his sight.
Even souls that are totally pure and holy, his chosen ones, ..
In short, the value aspect of who we are, proves God exists, because it needs his vision and judgment to have accurate reality.