“... a practical problem can only be solved by action itself. When your practical problem is how to earn a living, a book on how to make friends and influence people cannot solve it, though it may suggest things to do. Nothing short of the doing solves the problem. It is solved only by earning a living.”

“If the problem can be solved why worry? If the problem cannot be solved worrying will do you no good.”

“Solving a problem in a hundred years is, practically speaking, the same as not solving it at all.”

“Your only real problem is mortality! No religion can solve this problem, but science can do!”

“The best protection against propaganda of any sort is the recognition of it for what it is. Only hidden and undetected oratory is really insidious. What reaches the heart without going through the mind is likely to bounce back and put the mind out of business. Propaganda taken in that way is like a drug you do not know you are swallowing. The effect is mysterious; you do not know afterwards why you feel or think the way you do.”

“That is not how you do it; you do not solve one problem with another, greater problem.”

“Life is problems. Living is solving problems.”