The best Quotations

Surmounting difficulty is the crucible that forms character.
- Anthony Robbins

Do you know the writers of the following quotations?

Quotation To John I owed great obligation; but John, unhappily, thought fit to publish it to all the nation: Sure John and I are more than quit. - writer
Quotation A gloomy guest fits not a wedding feast. - writer
Quotation The secret of success is to know something nobody else knows. - writer
Quotation The author himself is the best judge of his own performance; none has so deeply meditated on the subject; none is so sincerely interested in the event. - writer
Quotation Love is the same as like except you feel sexier. - writer
Quotation What one has, one ought to use: and whatever he does he should do with all his might. - writer