You shouldn't take money from someone else.
Sal is on the bus when he spots a twenty dollar bill sticking out of a sleeping mans pocket.
Sal wants to go see a movie.
Sal resists the urge to steal and buys a movie ticket with his own money.
Sal grabs the twenty dollar bill and uses it to see a movie at the local theater.
Sal feels good about himself for not taking something that doesn't belong to him and being self sufficient.
Sal feels like a scumbag for taking money instead of just buying the ticket with his own money.