The best Quotations

The two most beautiful words in the english language are: ''check enclosed.''
- Dorothy Parker

Do you know the writers of the following quotations?

Quotation Whom the gods wish to destroy they first call promising. - writer
Quotation No one can be right all of the time, but it helps to be right most of the time. - writer
Quotation We know nothing about motivation. All we can do is write books about it. - writer
Quotation Don't wish it were easier, wish you were better. - writer
Quotation Sincerity is the highest complement you can pay, - writer
Quotation This is a fault common to all singers, that among their friends they will never sing when they are asked; unasked, they will never desist. - writer