A trail through the mountains, if used, becomes a path in a short time, but, if unused, becomes blocked by grass in an equally short time. Mencius
It is in the admission of ignorance and the admission of uncertainty that there is a hope for the continuous motion of human beings in some direction that doesn't get confined, permanently blocked, as it has so many times before in various periods in the history of man. Richard P. Feynman
We have lost that which has made us great over the generations, and that is the sense of individual and personal responsibility that we can come up, we can pursue our dreams and our aspirations and we won't be blocked by government regulation, by the inability to get a loan as a small business to make our dreams come true. Jon Huntsman, Jr.
I was in Shanghai recently, where Twitter is blocked, and yet there were ads and billboards across town with hashtags on them. Dick Costolo
Success is blocked by concentrating on it and planning for it... Success is shy - it won't come out while you're watching. Tennessee Williams