“The difference between what the most and the least learned people know is inexpressibly trivial in relation to that which is unknown.”

“In the middle of every difficulty lies opportunity.”

“It is the unknown that excites the ardor of scholars, who, in the known alone, would wither.”

“We cannot solve our problems with the same thinking we used when we created them.”

“I have tried 99 times and have failed, but on the 100th time came success.”