Dag Hammarskjöld said this quote

A heart pulsating in harmony with the circulation of sap and the flow of rivers? A body with the rhythms of the earth in its movements? No. Instead: a mind, shut off from the oxygen of alert senses, that has wasted itself on 'treasons, stratagems and spoils'--of importance only within four walls. A tame animal--in whom the strength of the species has outspent itself, to no purpose.