Remember your biggest success? Remember how people acknowledged and admired and your heart burst with immortal energy?
Remember your biggest failure? Your worst disappointment, foulest shame and when you wished the earth would just swallow you whole and forget that you ever existed?
Between those moments of extremes are the mundane. The long laps of unacknowledged & lonesome work that nobody talks about because they're so ordinary. So uninspiring.
If you look at anybody's success or failure, remember that they too have gone through those moments of crushing doubt; when nobody appreciated them waking up in the morning (every freezing and foulmouthed day), when nobody sent credit for not quitting for another day even in the absence of clear purpose, when the world forgot and existence became a mere, troublesome angst.
Have courage. Most of the time, most of us are there too.