The courage to show up when you don't need anything but because you know you can contribute. The courage to show up knowing that you could be criticized, but not by those whose opinion matters to you. Any fool can criticize, complain, and judge, and as Dale Carnegie says, most fools do. But it takes courage and character to show up for work that matters, even when you can't control the outcome.
On the other hand, if your work has never been criticized, it will be very hard to perform at your best. So you have to discern between useful criticism—that is a gift for those who care—and everything else you should pass over.
Every day is unique. Every day is an opportunity. You decide how you want to live it.
“It is not the critic who counts; not the man who points out how the strong man stumbles or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows, in the end, the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat.”
— Theodore Roosevelt