Phil Mickelson has been transparent about his gambling addiction, but in a new 414-word social media post, the six-time major champion went into detail about some of his lowest lows.

With the new football season underway, Mickelson’s message served as both a warning to current bettors and a precautionary tale about his own inability to draw the line.

In the recently released autobiography by Billy Walters—Mickelson’s betting partner of many years—the Las Vegas businessman and convicted felon wrote that the LIV golfer bet more than $1 billion on sports. He also alleged that Mickelson attempted to wager on the 2012 Ryder Cup in which he participated.