In today's gospel we are called to be both salt and light for the world.
Just so, your light must shine before others, that they may see your good deeds and glorify your heavenly Father.
On the Spiritual level we are to be salt that adds to the flavor or life, and light that enlightens the world. And on that level I don't think are any of us who can say we experience an excess of that. And even more to the point I doubt that any of us can claim that we bring too much salt or light to others.
The text above is an imperative, your light must shine. As Christians, filled with the Holy Spirit, it should be our default behavior. And yet, we get sucked into the darkness of the world. We see the flaws first. We complain about small things.
Today let each of us choose to be better. Let us choose to be light. And while the voice inside our heads may still critique and complain. Let's just keep that to ourselves, until we can break the habit.