Here’s a great article discussing five lessons from history.
At least three of them are applicable to business, especially #4:
Progress happens too slowly for people to notice; setbacks happen too fast for people to ignore.
For example, did you know that nobody really took notice of the Wright brothers and their flying machines until more than 4 years AFTER their first successful flight?
This is why grit and resilience are such important traits when you work for yourself. You often have to wait a long time to reap what you sow.