"If you're going through hell, keep on going" - Winston Churchill
"...And this too shall pass" -- last line of a well known prayer
"...and help me to accept the things I can not change". -- A line from The Serenity Prayer.
I think this would be a good thread to keep going. I know others have sayings that keep them going and hope you all will give to others by posting quotes, thoughts, whatever keeps you in the saddle. These are mine.