"I take it that the good of mankind means the attainment, by every man, of all the happiness which he can enjoy without diminishing the happiness of his fellow men."

"No delusion is greater than the notion that method and industry can make up for lack of mother-wit, either in science or in practical life."

"The man of science has learned to believe in justification, not by faith, but by verification."

"No slavery can be abolished without a double emancipation, and the master will benefit by freedom more than the freed-man."

"Millions of young Americans have graduated from college during the Obama presidency, ready to use their gifts and get moving in life. Half of them can't find the work they studied for, or any work at all. So here's the question: Without a change in leadership, why would the next four years be any different from the last four years?"

"Any man today who returns from work, sinks into a chair, and calls for his pipe is a man with an appetite for danger."

"I have never once regretted missing a business opportunity so that I could be with my children and grandchildren."

"For someone who's had the level of success I've had, there's been very little critical review of my work, which is pretty fascinating."