I will not be concerned at other men's not knowing me;I will be concerned at my own want of ability. Confucius
The only thing that makes life possible is permanent, intolerable uncertainty: not knowing what comes next. Ursula K. Le Guin
Risk comes from not knowing what you're doing. Warren Buffett
Although men are accused of not knowing their own weakness, yet perhaps few know their own strength. It is in men as in soils, where sometimes there is a vein of gold which the owner knows not of. Jonathan Swift
Thinking is not knowing. Portuguese Proverb
Virtue is not knowing but doing. Japanese Proverb