The best Quotations

Do you know the writers of the following quotations?

Quotation When a man does a household job, he goes through three periods: contemplating how it will be done; contemplating when it will be done; and contemplating. - writer
Quotation Nothing has such power to broaden the mind as the ability to investigate systematically and truly all that comes under thy observation in life. - writer
Quotation Marriage is the death of hope. - writer
Quotation Nature uses human imagination to lift her work of creation to even higher levels. - writer
Quotation You learn to speak by speaking, to study by studying, to run by running, to work by working; in just the same way, you learn to love by loving. - writer
Quotation Isolation is the sum total of wretchedness to a man. - writer