Real grit is needed to allow cash to go out to build a business week after week, month after month knowing that at some time (and some time sooner) it must start coming back into the business. Otherwise there is no business. Lack of profitability is often not the killer of the business: it's simply running out of cash.
The graphs we need 1: the inverted 'U' and diminishing returns.
The graphs we need 2: learning and the staircase.
The graphs we need 3: attention vs. time in your presentation
Bonus: Love Presenting, Hate (badly used) PowerPoint
The graphs we need 4: Gaining Mastery