It is wrong to steal from your work.
Martin had to stay late at work and didn't have time to shop for poster making supplies.
Martin wants to make some posters.
Martin buys the supplies he needs the following day and still has time to make the posters.
Martin decides to take all the supplies that he needs from work, even though he knows it is prohibited.
Martin is glad that he did not jeopardize his job by taking supplies from his work place.
Martin is fired after his boss found out what he did.