The best Quotations

Get well cards have become so humorous that if you don't get sick you're missing half the fun.
- Flip Wilson

Do you know the writers of the following quotations?

Quotation In art, all who have done something other than their predecessors have merited the epithet of revolutionary; and it is they alone who are masters. - writer
Quotation The hearing ear is always found close to the speaking tongue; and no genius can long or often utter anything which is not invited and gladly entertained by men around him. - writer
Quotation Labor is work that leaves no trace behind it when it is finished, or if it does, as in the case of the tilled field, this product of human activity requires still more labor, incessant, tireless labor, to maintain its identity as a ''work'' of man. - writer
Quotation There is great treasure there behind our skull and this is true about all of us. This little treasure has great, great powers, and I would say we only have learnt a very, very small part of what it can do. - writer
Quotation Industrial man -a sentient reciprocating engine having a fluctuating output, coupled to an iron wheel revolving with uniform velocity. And then we wonder why this should be the golden age of revolution and mental derangement. - writer
Quotation The shepherd drives the wolf from the sheep's throat, for which the sheep thanks the shepherd as his liberator, while the wolf denounces him for the same act as the destroyer of liberty. - writer