to boldly split infinitives that no man had split before

Fear made our gods, boldness has made our kings.

Great deeds are usually wrought at great risks.

Great deeds are usually wrought at great risks.

It is in great dangers that we see great courage.

Far back in the mists of ancient time, in the great and glorious days of the former Galactic Empire, life was wild, rich and largely tax free. Mighty starships plied their way between exotic suns, seeking adventure and reward among the furthest reaches of Galactic space. In those days spirits were brave, the stakes were high, men were real men, women were real women and small furry creatures from Alpha Centauri were real small furry creatures from Alpha Centauri. And all dared to brave unknown terrors, to do mighty deeds, to boldly split infinitives that no man had split before — and thus was the Empire forged.
...In these enlightened days, of course, no one believes a word of it.

Begin, be bold, and venture to be wise.

did you not call this a glorious expedition? and wherefore was it glorious? not because the way was smooth and placid as a southern sea, but because it was full of dangers and terror, because at every new incident your fortitude was to be called forth and your courage exhibited, because danger and death surrounded it, and these you were brave to overcome. for this was it a glorious , for this was it an honorable undertaking

What do you mean? What do you demand of your captain? Are you then so easily turned from your design? Did you not call this a glorious expedition? And wherefore was it glorious? Not because the way was smooth and placid as a southern sea, but because it was full of dangers and terror; because at every new incident your fortitude was to be called forth and your courage exhibited; because danger and death surrounded it, and these you were to brave and overcome. For this was it a glorious, for this was it an honourable undertaking. You were hereafter to be hailed as the benefactors of your species; your names adored as belonging to brave men who encountered death for honour and the benefit of mankind. And now, behold, with the first imagination of danger, or, if you will, the first mighty and terrific trial of your courage, you shrink away, and are content to be handed down as men who had not strength enough to endure cold and peril; and so, poor souls, they were chilly and returned to their warm firesides. Why that requires not this preparation; ye need not have come thus far, and dragged your captain to the shame of a defeat, merely to prove yourselves cowards. Oh! be men, or be more than men. Be steady to your purposes and firm as a rock. This ice is not made of such stuff as your hearts may be; it is mutable and cannot withstand you if you say that it shall not. Do not return to your families with the stigma of disgrace marked on your brows. Return as heroes who have fought and conquered, and who know not what it is to turn their backs on the foe.

When the dark and vengeful spirit of slavery, always ambitious, preferring to rule in hell than to serve in heaven, fired the southern heart and stirred all the malign elements of discord, when our great republic, the hope of freedom and self-government throughout the world, had reached the point of supreme peril, when the Union of these states was torn and rent asunder at the center, and the armies of a gigantic rebellion came forth with broad blades and bloody hands to destroy the very foundations of American society, the unknown braves who flung themselves into the yawning chasm, where cannon roared and bullets whistled, fought and fell. They died for their country.

Whatever you can do, or dream, begin it! For boldness has genius, power, and magic in it.

He dared to do what men and women don't even dare to think. And look what he's done already: he's torn open the sky, he's opened the way to another world. Who else has ever done that? Who else could think of it?

Whatever you can do, or dream you can, begin it. / Boldness has genius, power, and magic in it.

Doing anything new and bold in life typically means entering unchartered waters and writing the rules yourself. Don't be afraid to invent.