Date: 1732

"You must know, said he, that the mind of man may be fitly compared to a piece of land. What stubbing, ploughing, digging, and harrowing is to the one, that thinking, reflecting, examining is to the other."

— Berkeley, George (1685-1753)

Date: 1798

"On the contrary, if, to entice him to enter the paths of knowledge, we strew them with flowers, how will he feel when he must force his way through thorns and briars?"

— Edgeworth, Maria