This refers to the proposition that a persistent gambler who continues to stake a huge amount of his bankroll on a sufficient number of risky bets will eventually go bankrupt. This happens because a gambler who doesn't know what to stake on a bet is likely, at some point, to bet a huge portion or even all of his bankroll on a bet that is stacked against him and lose most or all of his money. Gambler’s ruin is used to emphasise the importance of money management to avoid the chances of ruin. It was first proposed by French mathematician Blaise Pascal during his correspondence with fellow mathematician Pierre de Fermat in the mid-17th century.