Goethe

"If you call a thing bad you do little, if you call a thing good you do much."

“Then 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 has genius, power and magic in it.”

"What is not started today is never finished tomorrow.”