Actor Robert De Niro has played a Machiavellian mafia boss, a crooked Casino operator, a gun-­wielding taxi driver, a master thief and a raging bull.

In his latest movie, ­Limitless, De Niro, 67, takes an almost professorial role (think of it as Professor Godfather teaching Gordon Gekko), explaining through his own experiences how Wall Street climbers can make the ascent in a postcrash, Fed-­regulated environment. Some of the comments sound timeless, and some downright mafia­esque.

“Climb up the greasy little rungs on the ladder,” De Niro, who plays a corporate raider, says to an ambitious colleague who absorbs mental powers by swallowing a pill; marry “the girl with the right father”; and threaten, bribe and charm your way into that “seat at the table.”

Not only is greed good, as Gekko would have it, so are extortion, manipulation and old-­fashioned bribery.