"There is nothing so useless as doing efficiently that which should not be done at all."

"Efficiency is doing things right; effectiveness is doing the right things."

"Management is doing things right; leadership is doing the right things."

"Innovation is the specific instrument of entrepreneurship. The act that endows resources with a new capacity to create wealth."

"When a subject becomes totally obsolete we make it a required course."

"We are more interested in making others believe we are happy than in trying to be happy ourselves."

"Why can we remember the tiniest detail that has happened to us, and not remember how many times we have told it to the same person."

"Why is it that our memory is good enough to retain the least triviality that happens to us, and yet not good enough to recollect how often we have told it to the same person?"

"When our vices leave us, we like to imagine it is we who are leaving them."

"When a man must force himself to be faithful in his love, this is hardly better than unfaithfulness."

"It's the height of folly to want to be the only wise one."

"It is more easy to be wise for others than for ourselves."

"Sincerity is an openness of heart; we find it in very few people; what we usually see is only an artful dissimulation to win the confidence of others."

"Why is our memory good enough to recall to the last detail things that have happened to us, yet not good enough to recall how often we have told them to the same person."

"Listening well and answering well is one of the greatest perfections that can be obtained in conversation."

"If we are to judge of love by its consequences, it more nearly resembles hatred than friendship."

"We think very few people sensible, except those who are of our opinion."

"We credit scarcely any persons with good sense except those who are of our opinion."

"We would frequently be ashamed of our good deeds if people saw all of the motives that produced them."

"We promise according to our hopes and perform according to our fears."

"It is great folly to wish to be wise all alone."

"As it is the characteristic of great wits to say much in few words, so small wits seem to have the gift of speaking much and saying nothing."

"Weak people cannot be sincere."

"How can we accept another to keep our secret if we have been unable to keep it ourselves."