Grit and bear it; the grin is not required.
Grit your teeth if you must, grind on anyway.
Grind on; sans grit.
True as grit; false as grand.
Grit in the face of danger.
Grit is found in two places; in the dirt and in the person in the dirt.
Sandpaper your words; use a fine grit.
Eat sand; blast injustice.
The good life requires grit — and gratitude.
Modern Thought Proverbs, Aphorisms and Epigrams 