We would accomplish many more things if we did not think of them as impossible.
C. Malesherbes
"I can't do it" never yet accomplished anything; "I will try" has performed wonders.
George P. Burnham
Throughout the centuries there were men who took first steps down new roads armed with nothing but their own vision.
Ayn Rand
Start by doing what's necessary, then what's possible, and suddenly you are doing the impossible.
Francis of Assisi
To accomplish great things, we must not only act, but also dream, not only plan, but also believe.
Anatole France