[achillesheels]

From what I can perceive, he has a poor habit of not sticking to something. Yes, there are ups and downs in all entrepreneurial journeys. Focusing and persevering as opposed to becoming emotional (both in the ups and downs) paves success.

"If you can dream—and not make dreams your master; If you can think—and not make thoughts your aim; If you can meet with Triumph and Disaster And treat those two impostors just the same; If you can bear to hear the truth you’ve spoken Twisted by knaves to make a trap for fools, Or watch the things you gave your life to, broken, And stoop and build ’em up with worn-out tools:"

-'If' by Rudyard Kipling