And what they dare to dream of, dare to do

From James Russell Lowell's Ode Recited at the Harvard Commemoration July 21, 1865.

Many loved Truth, and lavished life's best oil
Amid the dust of books to find her,
Content at last, for guerdon of their toil,
With the cast mantle she hath left behind her.
Many in sad faith sought for her,
Many with crossed hands sighed for her;
But these, our brothers, fought for her,
At life's dear peril wrought for her,
So loved her that they died for her,
Tasting the raptured fleetness
Of her divine completeness:
Their higher instinct knew
Those love her best who to themselves are true,
And what they dare to dream of, dare to do.