If you are unsure of a course of action, do not attempt it. Your doubts and hesitations will infect your execution. Timidity is dangerous: Better to enter with boldness. Any mistakes you commit through audacity are easily corrected with more audacity. Everyone admires the bold; no one honors the timid.
– Robert Greene
The indecision brings its own delays, and days are lost lamenting o’er lost days. Are you in earnest? Seize this very minute; what you can do, or dream you can, begin it; boldness as genius, power and magic in it
– Johann Wolfgang von Goethe