"Success is a science; if you have the conditions, you get the result."
"A thing is not the truth till it is so strongly believed in, that the believer is convinced that its existence does not depend upon him"
"It is only the superficial qualities that last. Man's deeper nature is soon found out."
"Between the optimist and the pessimist, the difference is droll. The optimist sees the doughnut; the pessimist the hole!"
"The truth is we cannot have it all. There is a deficit problem. Something will have to give."
"There is no sin except stupidity."
"The truth will set you free, but first it will make you miserable."
"Truth will always be truth, regardless of lack of understanding, disbelief or ignorance."
"The exact contrary of what is generally believed is often the truth"
"By persistently remaining single a man converts himself into a permanent public temptation."