Your ancestors are responsible for the weaknesses you inherit, but you are responsible for non-improvement.
mid-15c., enprowment "management of something for profit," from Anglo-French emprowement, from emprouwer "turn to profit" (see improve). Meaning "betterment; amelioration" is from 1640s. Meaning "buildings, etc. on a piece of property" is from 1773. Related: Improvements.