"Whatever you can do, or dream you can, begin it.
Boldness has genius, power, and magic in it."
(Johann Wolfgang von Goethe?)
I think the above quotation is rather good, hence why I have included it here.
But, is it by Goethe? Well, for a start, Goethe didn't write in English, and this quotation tends to feature as part of a larger quote from W H Murray, a Scottish Mountaineer, who, explaining that once committed to a plan, all sorts of support can be found, and that he had great respect for what he called the "Goethe couplet".
It turns out that the couplet is from what is described as a "very free" translation of the original by John Anster in 1835 (and frankly seems far more memorable than what is presumably a more literal version of the same passage included on the Goethe society site).
So, well done Mr Anster. Good stuff!