"To be a worldly success, it seems, you have to wear blinkers"

This line picks up the ruminations of the drunk, Larry Slade, in The Iceman Cometh by Eugene O'Neill:

I was condemned to be one of those who has to see all sides of a question. When you’re damned like that, the questions multiply for you until in the end it’s all questions and no answer. As history proves, to be a worldly success at anything, especially revolution, you have to wear blinders like a horse and see only straight in front of you.