What does no kernel of nourishing corn can come to him but through his toil bestowed on that plot of ground which is given to him to till?

Means that you should be self reliant when working on your own mind to gain knowledge and not letting anyone else change your thoughts.

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.