“Lack of money is the root of all evil”

“Wisdom is the right use of knowledge. To know is not to be wise. Many men know a great deal, and are all the greater fools for it. There is no fool so great a fool as a knowing fool. But to know how to use knowledge is to have wisdom.”

“Authority without wisdom is like a heavy axe without an edge, fitter to bruise than polish”

“Anyone who has never made a mistake has never tried anything new”

“Difficulties exist to be surmounted”

“A lifetime of happiness! No man alive could bear it: it would be hell on earth”