There's a popular remark among gamblers in the part of my country I reside. The saying is expressed like this "if you quit that's when you lose". They use this statement to encourage and give futuristic hope to themselves that no matter how much they loss today or how many wagers they have lost they don't need to quit as it's possible you may be the next jackpot winner tomorrow. For it's like say don't quit yet there may be a light at the end of the tunnel.
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In my country there is an expression: "he who does not risk does not drink champagne". We drink champagne on special occasions or holidays or when we want to celebrate something special. The gambler who risked and won can also celebrate his winnings by drinking a glass of champagne. After all, to win a lot of money is a big event. But it happens very rarely. The gambler who lost is likely to drink strong alcohol from his grief, but he dreams that sooner or later he will drink champagne.
This expression does not encourage gamblers to stop and think, rather it pushes them to take risks.