Petty theft to us now, but in previous ages there was much more scarcity, so any particular item would have been a higher percentage of a person's 'wealth' (property).
Further remember that labour is the use of one's most precious resource, time (spent living), for either money or goods (if one crafts something themselves). By stealing a possession, you are stealing a portion of a person's life (that they use to earn/make that possession).
Petty theft to us now, but in previous ages there was much more scarcity, so any particular item would have been a higher percentage of a person's 'wealth' (property).
Further remember that labour is the use of one's most precious resource, time (spent living), for either money or goods (if one crafts something themselves). By stealing a possession, you are stealing a portion of a person's life (that they use to earn/make that possession).