Action springs not from thought, but from a readiness for responsibility.
Dietrich Bonhoeffer 

After it, follow it, Follow The Gleam.
Lord Tennyson 

Ah, but a man's reach should exceed his grasp -- or what's a heaven for?
Robert Browning 

All things are difficult before they are easy.
Thomas Fuller  , M.D.

Always do right; this will gratify some people and astonish the rest.
Mark Twain (1835-1910) 

Always do what you are afraid to do.
Ralph Waldo Emerson (1803-1882) 

Ambition should be made of sterner stuff.
William Shakespeare  - Julius Caesar

And though hard be the task, 'Keep a stiff upper lip'.
Phoebe Cary 

Argue for your limitations and sure enough they're yours.
Richard Bach 

As for courage and will - we cannot measure how much of each lies within us, we can only trust there will be sufficient to carry through trials which may lie ahead.
Andre Norton